Kernel: Use Userspace<T> for the getresuid syscall

Kernel/Process.h

@@ -216,7 +216,7 @@ public:
     gid_t sys$getegid();
     pid_t sys$getpid();
     pid_t sys$getppid();
-    int sys$getresuid(uid_t*, uid_t*, uid_t*);
+    int sys$getresuid(Userspace<uid_t*>, Userspace<uid_t*>, Userspace<uid_t*>);
     int sys$getresgid(gid_t*, gid_t*, gid_t*);
     mode_t sys$umask(mode_t);
     int sys$open(Userspace<const Syscall::SC_open_params*>);

Kernel/Syscalls/getuid.cpp

@@ -52,7 +52,7 @@ gid_t Process::sys$getegid()
     return m_egid;
 }
 
-int Process::sys$getresuid(uid_t* ruid, uid_t* euid, uid_t* suid)
+int Process::sys$getresuid(Userspace<uid_t*> ruid, Userspace<uid_t*> euid, Userspace<uid_t*> suid)
 {
     REQUIRE_PROMISE(stdio);
     if (!validate_write_typed(ruid) || !validate_write_typed(euid) || !validate_write_typed(suid))