Make if_let_mutex test pass on both 2021 and 2024 editions

Author: GuillaumeGomez

tests/ui/if_let_mutex.edition2021.stderr

@@ -1,5 +1,5 @@
 error: calling `Mutex::lock` inside the scope of another `Mutex::lock` causes a deadlock
-  --> tests/ui/if_let_mutex.rs:16:5
+  --> tests/ui/if_let_mutex.rs:17:5
    |
 LL |       if let Err(locked) = m.lock() {
    |       ^                    - this Mutex will remain locked for the entire `if let`-block...
@@ -19,7 +19,7 @@ LL | |     };
    = help: to override `-D warnings` add `#[allow(clippy::if_let_mutex)]`
 
 error: calling `Mutex::lock` inside the scope of another `Mutex::lock` causes a deadlock
-  --> tests/ui/if_let_mutex.rs:29:5
+  --> tests/ui/if_let_mutex.rs:30:5
    |
 LL |       if let Some(locked) = m.lock().unwrap().deref() {
    |       ^                     - this Mutex will remain locked for the entire `if let`-block...
@@ -37,7 +37,7 @@ LL | |     };
    = help: move the lock call outside of the `if let ...` expression
 
 error: calling `Mutex::lock` inside the scope of another `Mutex::lock` causes a deadlock
-  --> tests/ui/if_let_mutex.rs:51:5
+  --> tests/ui/if_let_mutex.rs:52:5
    |
 LL |       if let Ok(i) = mutex.lock() {
    |       ^              ----- this Mutex will remain locked for the entire `if let`-block...
@@ -54,7 +54,7 @@ LL | |     };
    = help: move the lock call outside of the `if let ...` expression
 
 error: calling `Mutex::lock` inside the scope of another `Mutex::lock` causes a deadlock
-  --> tests/ui/if_let_mutex.rs:60:5
+  --> tests/ui/if_let_mutex.rs:61:5
    |
 LL |       if let Ok(_) = m1.lock() {
    |       ^              -- this Mutex will remain locked for the entire `if let`-block...

tests/ui/if_let_mutex.rs

@@ -3,6 +3,7 @@
 //@revisions: edition2021 edition2024
 //@[edition2021] edition:2021
 //@[edition2024] edition:2024
+//@[edition2024] check-pass
 #![warn(clippy::if_let_mutex)]
 #![allow(clippy::redundant_pattern_matching)]
 
@@ -62,10 +63,7 @@ fn multiple_mutexes(m1: &Mutex<()>, m2: &Mutex<()>) {
     } else {
         m1.lock();
     }
-    //~^ if_let_mutex
-    //~^ if_let_mutex
-    //~^ if_let_mutex
-    //~^ if_let_mutex
+    //~[edition2021]^^^^^ if_let_mutex
 }
 
 fn main() {}