t18-status.c: fix unused warnings

Signed-off-by: schu <schu-github@schulog.org>

tests/t18-status.c

@@ -154,14 +154,14 @@ BEGIN_TEST(statuscb0, "test retrieving status for worktree of repository")
 	git_futils_rmdir_r(TEMP_REPO_FOLDER, 1);
 END_TEST
 
-static int status_cb1(const char *path, unsigned int status_flags, void *payload)
+static int status_cb1(const char *GIT_UNUSED(path), unsigned int GIT_UNUSED(status_flags), void *payload)
 {
 	int *count = (int *)payload;;
 
 	GIT_UNUSED_ARG(path);
 	GIT_UNUSED_ARG(status_flags);
 
-	*count++;
+	(void) *count++;
 
 	return GIT_SUCCESS;
 }
@@ -445,4 +445,4 @@ BEGIN_SUITE(status)
 	ADD_TEST(singlestatus2);
 	ADD_TEST(singlestatus3);
 	ADD_TEST(singlestatus4);
-END_SUITE
\ No newline at end of file
+END_SUITE