[NET]: Fix dentry leak in sys_accept().

This regression was added by commit:
39d8c1b6
("Do not lose accepted socket when -ENFILE/-EMFILE.")

This is based upon a patch from Andi Kleen.

Thanks to Adrian Bridgett for narrowing down a good test case, and to
Andi Kleen and Andrew Morton for eyeballing this code.
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

net/socket.c

@@ -1455,7 +1455,7 @@ asmlinkage long sys_accept(int fd, struct sockaddr __user *upeer_sockaddr, int _
 out:
 	return err;
 out_fd:
-	put_filp(newfile);
+	fput(newfile);
 	put_unused_fd(newfd);
 out_release:
 	sock_release(newsock);