Check for return value of normalize_package

Upon failure to download an AUR package, normalize_package returns NULL. In
crawl_resolve, the return value from the initial normalize_package is checked,
but not the ones when we normalize dependencies. They should also be checked
in the case of failure so we can abort the entire operation asap.

Signed-off-by: Pang Yan Han <pangyanhan@gmail.com>

query.c

@@ -318,6 +318,11 @@ static int crawl_resolve(CURL *curl, struct pw_hashdb *hashdb, struct pkgpair *c
 	depmod_list = alpm_pkg_get_depends(pkgpair->pkg);
 	for (i = depmod_list; i; i = i->next) {
 		depname = normalize_package(curl, hashdb, alpm_dep_get_name(i->data), force);
+		/* Possibility of normalize_package fail due to AUR download failing */
+		if (!depname) {
+			alpm_list_free(deps);
+			return -1;
+		}
 		deps = alpm_list_add(deps, (void *) depname);
 	}