rust: drop block-wrapped scrutinees rejected by clippy 1.99

block_scrutinee now warns on a block-wrapped if let scrutinee, since
the block changes when temporaries drop. The file config reads in the
nfs, smb and http2 gettxfiles handlers were wrapped in a pointless
single-expression block; remove it.

rust/src/http2/http2.rs

@@ -1759,7 +1759,7 @@ unsafe extern "C" fn http2_getfiles(
     tx: *mut std::os::raw::c_void, direction: u8,
 ) -> AppLayerGetFileState {
     let tx = cast_pointer!(tx, HTTP2Transaction);
-    if let Some(sfcm) = { SURICATA_HTTP2_FILE_CONFIG } {
+    if let Some(sfcm) = SURICATA_HTTP2_FILE_CONFIG {
         if direction & STREAM_TOSERVER != 0 {
             return AppLayerGetFileState {
                 fc: &mut tx.ft_ts.file,

rust/src/nfs/nfs.rs

@@ -212,7 +212,7 @@ unsafe extern "C" fn nfs_gettxfiles(
     if let Some(NFSTransactionTypeData::FILE(ref mut tdf)) = tx.type_data {
         let tx_dir: u8 = tdf.direction.into();
         if direction & tx_dir != 0 {
-            if let Some(sfcm) = { SURICATA_NFS_FILE_CONFIG } {
+            if let Some(sfcm) = SURICATA_NFS_FILE_CONFIG {
                 return AppLayerGetFileState {
                     fc: &mut tdf.file_tracker.file,
                     cfg: sfcm.files_sbcfg,

rust/src/smb/files.rs

@@ -342,7 +342,7 @@ pub(super) unsafe extern "C" fn smb_gettxfiles(
     if let Some(SMBTransactionTypeData::FILE(ref mut tdf)) = tx.type_data {
         let tx_dir: u8 = tdf.direction.into();
         if direction & tx_dir != 0 {
-            if let Some(sfcm) = { SURICATA_SMB_FILE_CONFIG } {
+            if let Some(sfcm) = SURICATA_SMB_FILE_CONFIG {
                 return AppLayerGetFileState {
                     fc: &mut tdf.file_tracker.file,
                     cfg: sfcm.files_sbcfg,