uclient: fix memory leak of url when backend alloc fails

If backend->alloc() returned NULL, uclient_new() returned without
freeing the url structure parsed earlier, leaking it.

Assisted-by: Claude:claude-opus-4-7
Link: https://github.com/openwrt/uclient/pull/16
Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>

1 files changed, 3 insertions, 1 deletions

diff --git a/uclient.c b/uclient.c
index 0fb92b8..76f562c 100644
--- a/uclient.c
+++ b/uclient.c
@@ -257,8 +257,10 @@ struct uclient *uclient_new(const char *url_str, const char *auth_str, const str
 		return NULL;
 
 	cl = url->backend->alloc();
-	if (!cl)
+	if (!cl) {
+		free(url);
 		return NULL;
+	}
 
 	cl->backend = url->backend;
 	cl->cb = cb;