Kernel: Use Userspace<T> for the clock_settime syscall

Author: https://github.com/bgianfo
Commit: b069d757a3
Pull-request: https://github.com/SerenityOS/serenity/pull/3062
Reviewed-by: https://github.com/awesomekling

Kernel/Syscalls/clock.cpp

@@ -54,7 +54,7 @@ int Process::sys$clock_gettime(clockid_t clock_id, Userspace<timespec*> user_ts)
     return 0;
 }
 
-int Process::sys$clock_settime(clockid_t clock_id, const timespec* user_ts)
+int Process::sys$clock_settime(clockid_t clock_id, Userspace<const timespec*> user_ts)
 {
     REQUIRE_PROMISE(settime);