Kernel: Use Userspace<T> for the chroot syscall

Author: https://github.com/bgianfo
Commit: e8917cc5f3
Pull-request: https://github.com/SerenityOS/serenity/pull/3062
Reviewed-by: https://github.com/awesomekling

Kernel/Syscalls/chroot.cpp

@@ -31,7 +31,7 @@
 
 namespace Kernel {
 
-int Process::sys$chroot(const char* user_path, size_t path_length, int mount_flags)
+int Process::sys$chroot(Userspace<const char*> user_path, size_t path_length, int mount_flags)
 {
     if (!is_superuser())
         return -EPERM;