MFH: fix #38759 (PDO sqlite2 empty query causes segfault)

NEWS

@@ -5,6 +5,7 @@
   (marci at balabit dot hu, Tony)
 - Removed current working directory from the php.ini search path for CLI and
   readded it for other SAPIs (restore to pre 5.1.x behaviour). (Edin)
+- Fixed bug #38759 (PDO sqlite2 empty query causes segfault). (Tony)
 - Fixed bug #38700 (SoapClient::__getTypes never returns). (Dmitry)
 - Fixed bug #38693 (curl_multi_add_handle() set curl handle to null). (Ilia)
 - Fixed bug #38661 (mixed-case URL breaks url-wrappers). (Ilia)

ext/sqlite/libsqlite/src/vdbe.c

@@ -114,7 +114,7 @@ int sqlite_step(
   sqlite *db;
   int rc;
 
-  if( p->magic!=VDBE_MAGIC_RUN ){
+  if( !p || p->magic!=VDBE_MAGIC_RUN ){
     return SQLITE_MISUSE;
   }
   db = p->db;