Fix compiler warnings

* tests-clar/status: remove an unused variable
* clone: fix -Wmaybe-uninitialized warning

src/clone.c

@@ -153,7 +153,7 @@ static int update_head_to_new_branch(
 	const git_oid *target,
 	const char *name)
 {
-	git_reference *tracking_branch;
+	git_reference *tracking_branch = NULL;
 	int error;
 
 	if ((error = create_tracking_branch(

tests-clar/status/ignore.c

@@ -156,7 +156,6 @@ void test_status_ignore__ignore_pattern_contains_space(void)
 void test_status_ignore__ignore_pattern_ignorecase(void)
 {
 	unsigned int flags;
-	const mode_t mode = 0777;
 	bool ignore_case;
 	git_index *index;