fix clippy

Author: thanhnguyen-aws

library/kani_macros/src/sysroot/loop_contracts/mod.rs

@@ -234,24 +234,24 @@ fn transform_break_continue(block: &mut Block) {
 
 fn while_let_rewrite(loopexpr: Stmt) -> Stmt {
     if let Stmt::Expr(ref expr, _) = loopexpr {
-        if let Expr::While(ExprWhile { cond, body, .. }) = expr {
-            if let Expr::Let(ref let_expr) = **cond {
-                let pat = &let_expr.pat;
-                let scrutinee = &let_expr.expr;
-
-                // Transform to loop with match
-                return parse_quote! {
-                    loop {
-                        match #scrutinee {
-                            #pat => #body,
-                            _ => break,
-                        }
-                    };
+        if let Expr::While(ExprWhile { cond, body, .. }) = expr
+            && let Expr::Let(ref let_expr) = **cond
+        {
+            let pat = &let_expr.pat;
+            let scrutinee = &let_expr.expr;
+
+            // Transform to loop with match
+            return parse_quote! {
+                loop {
+                    match #scrutinee {
+                        #pat => #body,
+                        _ => break,
+                    }
                 };
-            }
+            };
         }
     }
-    return loopexpr.clone();
+    loopexpr.clone()
 }
 
 pub fn loop_invariant(attr: TokenStream, item: TokenStream) -> TokenStream {