revert unnecessary change

src/php/ext/grpc/call.c

@@ -125,9 +125,15 @@ zval *grpc_parse_metadata_array(grpc_metadata_array *metadata_array) {
     memcpy(str_val, elem->value, elem->value_length);
     if (zend_hash_find(array_hash, str_key, key_len, (void **)data) ==
         SUCCESS) {
+      if (Z_TYPE_P(*data) != IS_ARRAY) {
         zend_throw_exception(zend_exception_get_default(),
                              "Metadata hash somehow contains wrong types.",
                              1 TSRMLS_CC);
+        efree(str_key);
+        efree(str_val);
+        return NULL;
+      }
+      add_next_index_stringl(*data, str_val, elem->value_length, false);
     } else {
       MAKE_STD_ZVAL(inner_array);
       array_init(inner_array);