xspf: correct crash if psz_name is NULL

(cherry picked from commit 97c42d97)

modules/misc/playlist/xspf.c

@@ -263,10 +263,11 @@ static void xspf_extension_item( playlist_item_t *p_item, FILE *p_file,
     if( p_item->i_children >= 0 )
     {
         int i;
-        char *psz_temp;
-        psz_temp = convert_xml_special_chars( p_item->p_input->psz_name );
+        char *psz_temp = NULL;
+        if( p_item->p_input->psz_name )
+            psz_temp = convert_xml_special_chars( p_item->p_input->psz_name );
         fprintf( p_file, "\t\t<vlc:node title=\"%s\">\n",
-                 *psz_temp ? psz_temp : "" );
+                 psz_temp ? psz_temp : "" );
         free( psz_temp );
 
         for( i = 0; i < p_item->i_children; i++ )