rust: remove unnecessary lifetimes

Fix provided by cargo clipy --fix.

Backport of 7bdbe7ed32.

rust/src/smb/nbss_records.rs

@@ -34,7 +34,7 @@ pub struct NbssRecord<'a> {
     pub data: &'a[u8],
 }
 
-impl<'a> NbssRecord<'a> {
+impl NbssRecord<'_> {
     pub fn is_valid(&self) -> bool {
         let valid = match self.message_type {
             NBSS_MSGTYPE_SESSION_MESSAGE |

rust/src/smb/smb1_records.rs

@@ -817,7 +817,7 @@ pub struct SmbRecord<'a> {
     pub data: &'a[u8],
 }
 
-impl<'a> SmbRecord<'a> {
+impl SmbRecord<'_> {
     pub fn has_unicode_support(&self) -> bool {
         self.flags2 & 0x8000_u16 != 0
     }

rust/src/smb/smb2_records.rs

@@ -65,7 +65,7 @@ pub struct Smb2Record<'a> {
     pub data: &'a [u8],
 }
 
-impl<'a> Smb2Record<'a> {
+impl Smb2Record<'_> {
     pub fn is_request(&self) -> bool {
         self.direction == 0
     }

rust/src/snmp/snmp.rs

@@ -82,7 +82,7 @@ pub struct SNMPTransaction<'a> {
     tx_data: applayer::AppLayerTxData,
 }
 
-impl<'a> Transaction for SNMPTransaction<'a> {
+impl Transaction for SNMPTransaction<'_> {
     fn id(&self) -> u64 {
         self.id
     }

rust/src/ssh/parser.rs

@@ -167,7 +167,7 @@ pub struct SshPacketKeyExchange<'a> {
 
 const SSH_HASSH_STRING_DELIMITER_SLICE: [u8; 1] = [b';'];
 
-impl<'a> SshPacketKeyExchange<'a> {
+impl SshPacketKeyExchange<'_> {
     pub fn generate_hassh(
         &self, hassh_string: &mut Vec<u8>, hassh: &mut Vec<u8>, to_server: &bool,
     ) {