rust: fix single_match

warning: you seem to be trying to use `match` for destructuring a single pattern. Consider using `if let`
   --> src/http2/parser.rs:882:17
    |
882 | /                 match ctx.value {
883 | |                     Some(_) => {
884 | |                         panic!("Unexpected value");
885 | |                     }
886 | |                     None => {}
887 | |                 }
    | |_________________^

rust/src/http2/parser.rs

@@ -879,12 +879,7 @@ mod tests {
         match r {
             Ok((rem, ctx)) => {
                 assert_eq!(ctx.id, HTTP2SettingsId::EnablePush);
-                match ctx.value {
+                assert!(ctx.value.is_none());
-                    Some(_) => {
-                        panic!("Unexpected value");
-                    }
-                    None => {}
-                }
                 assert_eq!(rem.len(), 0);
             }
             Err(e) => {

rust/src/ssh/parser.rs

@@ -552,11 +552,8 @@ mod tests {
         ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00];
         let mut hassh_string: Vec<u8> = vec!();
         let mut hassh: Vec<u8> = vec!();
-        match ssh_parse_key_exchange(&client_key_exchange){
+        if let Ok((_, key_exchange)) = ssh_parse_key_exchange(&client_key_exchange){
-            Ok((_, key_exchange)) => { 
+            key_exchange.generate_hassh(&mut hassh_string, &mut hassh, &true);
-                key_exchange.generate_hassh(&mut hassh_string, &mut hassh, &true); 
-            }
-            Err(_) => { }
         }
 
         assert_eq!(hassh_string, "curve25519-sha256,curve25519-sha256@libssh.org,\
@@ -643,11 +640,8 @@ mod tests {
         0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00];
         let mut hassh_server_string: Vec<u8> = vec!();
         let mut hassh_server: Vec<u8> = vec!();
-        match ssh_parse_key_exchange(&server_key_exchange){
+        if let Ok((_, key_exchange)) = ssh_parse_key_exchange(&server_key_exchange){
-            Ok((_, key_exchange)) => { 
+            key_exchange.generate_hassh(&mut hassh_server_string, &mut hassh_server, &true);
-                key_exchange.generate_hassh(&mut hassh_server_string, &mut hassh_server, &true);
-            }
-            Err(_) => { }
         }
         assert_eq!(hassh_server, "b12d2871a1189eff20364cf5333619ee".as_bytes().to_vec());
     }