Kernel: Use Userspace<T> for the setgroups syscall

Author: https://github.com/bgianfo
Commit: 80011cd62d
Pull-request: https://github.com/SerenityOS/serenity/pull/3062
Reviewed-by: https://github.com/awesomekling

Kernel/Process.h

@@ -264,7 +264,7 @@ public:
     int sys$sigprocmask(int how, const sigset_t* set, sigset_t* old_set);
     int sys$sigpending(sigset_t*);
     int sys$getgroups(ssize_t, gid_t*);
-    int sys$setgroups(ssize_t, const gid_t*);
+    int sys$setgroups(ssize_t, Userspace<const gid_t*>);
     int sys$pipe(int pipefd[2], int flags);
     int sys$killpg(pid_t pgrp, int sig);
     int sys$seteuid(uid_t);