rust/ike: fix collapsible_match clippy warning

warning: this `match` can be collapsed into the outer `match`
help: the outer pattern can be modified to include the inner pattern

rust/src/ike/ikev2.rs

@@ -186,8 +186,7 @@ fn add_proposals(
         // Rule 1: warn on weak or unknown transforms
         for xform in &transforms {
             match *xform {
-                IkeV2Transform::Encryption(ref enc) => {
-                    match *enc {
+                IkeV2Transform::Encryption(
                     IkeTransformEncType::ENCR_DES_IV64
                     | IkeTransformEncType::ENCR_DES
                     | IkeTransformEncType::ENCR_3DES
@@ -197,14 +196,11 @@ fn add_proposals(
                     | IkeTransformEncType::ENCR_BLOWFISH
                     | IkeTransformEncType::ENCR_3IDEA
                     | IkeTransformEncType::ENCR_DES_IV32
-                        | IkeTransformEncType::ENCR_NULL => {
-                            SCLogDebug!("Weak Encryption: {:?}", enc);
+                    | IkeTransformEncType::ENCR_NULL,
+                ) => {
                     // XXX send event only if direction == Direction::ToClient ?
                     tx.set_event(IkeEvent::WeakCryptoEnc);
                 }
-                        _ => (),
-                    }
-                }
                 IkeV2Transform::PRF(ref prf) => match *prf {
                     IkeTransformPRFType::PRF_NULL => {
                         SCLogDebug!("'Null' PRF transform proposed");