Fixed off-by-one in php_url_parse_ex

Change order of condition, previously pointer could be derefrenced before bound check was done.

Author: akat1

ext/standard/url.c

@@ -263,7 +263,7 @@ PHPAPI php_url *php_url_parse_ex(char const *str, int length)
 } else {
 /* memrchr is a GNU specific extension
  Emulate for wide compatability */
-for(p = e; *p != ':' && p >= s; p--);
+for(p = e; p >= s && *p != ':'; p--);
 }
 
 if (p >= s && *p == ':') {