Declare read-only parameters const

Signal callers arguments are not going to be modified and allow passing
const pointers.

libmisc/find_new_uid.c

@@ -98,7 +98,7 @@ static int get_ranges (bool sys_user, uid_t *min_id, uid_t *max_id,
 static int check_uid(const uid_t uid,
 		     const uid_t uid_min,
 		     const uid_t uid_max,
-		     bool *used_uids)
+		     const bool *used_uids)
 {
 	/* First test that the preferred ID is in the range */
 	if (uid < uid_min || uid > uid_max) {