Kernel: Use Userspace<T> for the accept syscall

Author: https://github.com/bgianfo
Commit: 8bd9dbc220
Pull-request: https://github.com/SerenityOS/serenity/pull/3062
Reviewed-by: https://github.com/awesomekling

Kernel/Process.h

@@ -293,7 +293,7 @@ public:
     int sys$socket(int domain, int type, int protocol);
     int sys$bind(int sockfd, Userspace<const sockaddr*> addr, socklen_t);
     int sys$listen(int sockfd, int backlog);
-    int sys$accept(int sockfd, sockaddr*, socklen_t*);
+    int sys$accept(int sockfd, Userspace<sockaddr*>, Userspace<socklen_t*>);
     int sys$connect(int sockfd, const sockaddr*, socklen_t);
     int sys$shutdown(int sockfd, int how);
     ssize_t sys$sendto(const Syscall::SC_sendto_params*);