Fixed not to set CR_MALFORMED_PACKET to error if CR_SERVER_GONE_ERROR is already set

Closes GH-11951.

Author: SakiTakamachi

NEWS

@@ -9,6 +9,10 @@ PHP                                                                        NEWS
   . Fixed bug #75712 (getenv in php-fpm should not read $_ENV, $_SERVER).
     (Jakub Zelenka)
 
+- MySQLnd:
+  . Fixed bug GH-11950 ([mysqlnd] Fixed not to set CR_MALFORMED_PACKET to error
+    if CR_SERVER_GONE_ERROR is already set). (Saki Takamachi)
+
 - PGSQL:
   . Fixed bug GH-13354 (pg_execute/pg_send_query_params/pg_send_execute
     with null value passed by reference). (George Barbarosie)

ext/mysqlnd/mysqlnd_wireprotocol.c

@@ -2488,8 +2488,10 @@ MYSQLND_METHOD(mysqlnd_protocol, send_command_handle_OK)(
 	payload_decoder_factory->m.init_ok_packet(&ok_response);
 	DBG_ENTER("mysqlnd_protocol::send_command_handle_OK");
 	if (FAIL == (ret = PACKET_READ(payload_decoder_factory->conn, &ok_response))) {
-		DBG_INF("Error while reading OK packet");
-		SET_CLIENT_ERROR(error_info, CR_MALFORMED_PACKET, UNKNOWN_SQLSTATE, "Malformed packet");
+		if (error_info->error_no != CR_SERVER_GONE_ERROR) {
+			DBG_INF("Error while reading OK packet");
+			SET_CLIENT_ERROR(error_info, CR_MALFORMED_PACKET, UNKNOWN_SQLSTATE, "Malformed packet");
+		}
 		goto end;
 	}
 	DBG_INF_FMT("OK from server");