Simplify is_in_method_chain by using matches! for method call checks

Author: a-yossy

clippy_lints/src/dereference.rs

@@ -729,16 +729,8 @@ 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 let ExprKind::MethodCall(_, recv, _, _) = e.kind {
-        match recv.kind {
-            ExprKind::MethodCall(..)
-            | ExprKind::Index(..)
-            | ExprKind::Match(.., MatchSource::TryDesugar(..) | MatchSource::AwaitDesugar)
-            | ExprKind::Field(..) => {
-                return true;
-            },
-            _ => {},
-        }
+    if matches!(e.kind, ExprKind::MethodCall(_, recv, _, _) if matches!(recv.kind, ExprKind::MethodCall(..))) {
+        return true;
     }
 
     if let Some(parent) = get_parent_expr(cx, e)