unix: It's CONFIG_PROC_FS not CONFIG_PROCFS

Fixes: 3a12500e ("unix: define and set show_fdinfo only if procfs is enabled")
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

net/unix/af_unix.c

@@ -682,7 +682,7 @@ static int unix_set_peek_off(struct sock *sk, int val)
 	return 0;
 }
 
-#ifdef CONFIG_PROCFS
+#ifdef CONFIG_PROC_FS
 static void unix_show_fdinfo(struct seq_file *m, struct socket *sock)
 {
 	struct sock *sk = sock->sk;