Fix a cppcheck warning.
'ap_unescape_urlencoded()' suggests that NULL can be passed to 'unescape_url()'.
So avoid a potential 'strchr(NULL, ...)' which is an undefined behavior.
@@ -1794,6 +1794,10 @@ static int unescape_url(char *url, const char *forbid, const char *reserved)
badesc = 0;
badpath = 0;
+
+ if (url == NULL) {
+ return OK;
+ }
/* Initial scan for first '%'. Don't bother writing values before
* seeing a '%' */
y = strchr(url, '%');
