Fix GH-12791: Possible dereference of NULL in MySQLnd debug code

Closes GH-12794.

Author: nielsdos

NEWS

@@ -26,6 +26,8 @@ PHP                                                                        NEWS
 
 - MySQLnd:
   . Avoid using uninitialised struct. (mikhainin)
+  . Fixed bug GH-12791 (Possible dereference of NULL in MySQLnd debug code).
+    (nielsdos)
 
 - OpenSSL:
   . Fixed bug #50713 (openssl_pkcs7_verify() may ignore untrusted CAs).

ext/mysqlnd/mysqlnd_result.c

@@ -735,8 +735,8 @@ MYSQLND_METHOD(mysqlnd_res, store_result_fetch_data)(MYSQLND_CONN_DATA * const c
 				UPSERT_STATUS_GET_SERVER_STATUS(conn->upsert_status));
 free_end:
 	PACKET_FREE(&row_packet);
+	DBG_INF_FMT("rows=%llu", (unsigned long long)set->row_count);
 end:
-	DBG_INF_FMT("rows=%llu", (unsigned long long)result->stored_data->row_count);
 	DBG_RETURN(ret);
 }
 /* }}} */