rust/clippy: fix lint: manual_find

These get_tx methods look like ideal candidates for generic and/or
derived methods.

rust/src/applayertemplate/template.rs

@@ -103,12 +103,7 @@ impl TemplateState {
     }
 
     pub fn get_tx(&mut self, tx_id: u64) -> Option<&TemplateTransaction> {
-        for tx in &mut self.transactions {
-            if tx.tx_id == tx_id + 1 {
-                return Some(tx);
-            }
-        }
-        return None;
+        self.transactions.iter().find(|tx| tx.tx_id == tx_id + 1)
     }
 
     fn new_tx(&mut self) -> TemplateTransaction {
@@ -119,12 +114,7 @@ impl TemplateState {
     }
 
     fn find_request(&mut self) -> Option<&mut TemplateTransaction> {
-        for tx in &mut self.transactions {
-            if tx.response.is_none() {
-                return Some(tx);
-            }
-        }
-        None
+        self.transactions.iter_mut().find(|tx| tx.response.is_none())
     }
 
     fn parse_request(&mut self, input: &[u8]) -> AppLayerResult {

rust/src/dhcp/dhcp.rs

@@ -148,12 +148,7 @@ impl DHCPState {
     }
 
     pub fn get_tx(&mut self, tx_id: u64) -> Option<&DHCPTransaction> {
-        for tx in &mut self.transactions {
-            if tx.tx_id == tx_id + 1 {
-                return Some(tx);
-            }
-        }
-        return None;
+        self.transactions.iter().find(|tx| tx.tx_id == tx_id + 1)
     }
 
     fn free_tx(&mut self, tx_id: u64) {

rust/src/ike/ike.rs

@@ -167,12 +167,7 @@ impl IKEState {
     }
 
     pub fn get_tx(&mut self, tx_id: u64) -> Option<&mut IKETransaction> {
-        for tx in &mut self.transactions {
-            if tx.tx_id == tx_id + 1 {
-                return Some(tx);
-            }
-        }
-        return None;
+        self.transactions.iter_mut().find(|tx| tx.tx_id == tx_id + 1)
     }
 
     pub fn new_tx(&mut self) -> IKETransaction {

rust/src/lib.rs

@@ -27,7 +27,6 @@
 #![allow(clippy::too_many_arguments)]
 
 // To be fixed, but remove the noise for now.
-#![allow(clippy::manual_find)]
 #![allow(clippy::match_like_matches_macro)]
 #![allow(clippy::module_inception)]
 #![allow(clippy::result_unit_err)]

rust/src/modbus/modbus.rs

@@ -113,12 +113,7 @@ impl ModbusState {
     }
 
     pub fn get_tx(&mut self, tx_id: u64) -> Option<&mut ModbusTransaction> {
-        for tx in &mut self.transactions {
-            if tx.id == tx_id + 1 {
-                return Some(tx);
-            }
-        }
-        None
+        self.transactions.iter_mut().find(|tx| tx.id == tx_id + 1)
     }
 
     /// Searches the requests in order to find one matching the given response. Returns the matching

rust/src/mqtt/mqtt.rs

@@ -158,12 +158,7 @@ impl MQTTState {
     }
 
     pub fn get_tx(&mut self, tx_id: u64) -> Option<&MQTTTransaction> {
-        for tx in &mut self.transactions {
-            if tx.tx_id == tx_id + 1 {
-                return Some(tx);
-            }
-        }
-        return None;
+        self.transactions.iter().find(|tx| tx.tx_id == tx_id + 1)
     }
 
     pub fn get_tx_by_pkt_id(&mut self, pkt_id: u32) -> Option<&mut MQTTTransaction> {

rust/src/pgsql/pgsql.rs

@@ -187,12 +187,7 @@ impl PgsqlState {
     }
 
     pub fn get_tx(&mut self, tx_id: u64) -> Option<&PgsqlTransaction> {
-        for tx in &mut self.transactions {
-            if tx.tx_id == tx_id + 1 {
-                return Some(tx);
-            }
-        }
-        return None;
+        self.transactions.iter().find(|tx| tx.tx_id == tx_id + 1)
     }
 
     fn new_tx(&mut self) -> PgsqlTransaction {

rust/src/rfb/rfb.rs

@@ -136,12 +136,7 @@ impl RFBState {
     }
 
     pub fn get_tx(&mut self, tx_id: u64) -> Option<&RFBTransaction> {
-        for tx in &mut self.transactions {
-            if tx.tx_id == tx_id + 1 {
-                return Some(tx);
-            }
-        }
-        return None;
+        self.transactions.iter().find(|tx| tx.tx_id == tx_id + 1)
     }
 
     fn new_tx(&mut self) -> RFBTransaction {
@@ -152,12 +147,8 @@ impl RFBState {
     }
 
     fn get_current_tx(&mut self) -> Option<&mut RFBTransaction> {
-        for tx in &mut self.transactions {
-            if tx.tx_id == self.tx_id {
-                return Some(tx);
-            }
-        }
-        return None;
+        let tx_id = self.tx_id;
+        self.transactions.iter_mut().find(|tx| tx.tx_id == tx_id)
     }
 
     fn parse_request(&mut self, input: &[u8]) -> AppLayerResult {

rust/src/telnet/telnet.rs

@@ -131,12 +131,7 @@ impl TelnetState {
     }
 
     pub fn get_tx(&mut self, tx_id: u64) -> Option<&TelnetTransaction> {
-        for tx in &mut self.transactions {
-            if tx.tx_id == tx_id + 1 {
-                return Some(tx);
-            }
-        }
-        return None;
+        self.transactions.iter().find(|tx| tx.tx_id == tx_id + 1)
     }
 
     fn _new_tx(&mut self) -> TelnetTransaction {