Improve method chain detection in is_in_method_chain

Author: a-yossy

clippy_lints/src/dereference.rs

@@ -729,7 +729,9 @@ fn deref_method_same_type<'tcx>(result_ty: Ty<'tcx>, arg_ty: Ty<'tcx>) -> bool {
 }
 
 fn is_in_method_chain<'tcx>(cx: &LateContext<'tcx>, e: &'tcx Expr<'tcx>) -> bool {
-    if matches!(e.kind, ExprKind::MethodCall(_, recv, _, _) if matches!(recv.kind, ExprKind::MethodCall(..))) {
+    if let ExprKind::MethodCall(_, recv, _, _) = e.kind
+        && matches!(recv.kind, ExprKind::MethodCall(..))
+    {
         return true;
     }