11972 resync smatch

@@ -345,11 +345,11 @@
                 while (expr->type == EXPR_DEREF) {
                         tmp = get_member_offset_from_deref(expr);
                         if (tmp < 0)
                                 return 0;
                         tmp_offset += tmp;
-                        expr = expr->deref;
+                        expr = strip_expr(expr->deref);
                 }
                 *offset = tmp_offset;
                 if (expr->type == EXPR_PREOP && expr->op == '*') {
                         expr = strip_expr(expr->unop);