Merge branch 'PHP-5.4'

* PHP-5.4:
  Fixed bug #62594 (segfault in mysqlnd_res_meta::set_mode)

Author: laruence

ext/mysqlnd/mysqlnd_debug.c

@@ -516,9 +516,11 @@ enum mysqlnd_debug_parser_state
 static void
 MYSQLND_METHOD(mysqlnd_debug, set_mode)(MYSQLND_DEBUG * self, const char * const mode)
 {
-	unsigned int mode_len = strlen(mode), i;
+	unsigned int mode_len, i;
 	enum mysqlnd_debug_parser_state state = PARSER_WAIT_MODIFIER;
 
+	mode_len = mode? strlen(mode) : 0;
+
 	self->flags = 0;
 	self->nest_level_limit = 0;
 	if (self->file_name && self->file_name != mysqlnd_debug_default_trace_file) {