net/ipv4/tcp.c: Fix use of PULLHUP instead of POLLHUP in comments.

Change PULLHUP to POLLHUP in tcp_poll comments and clean up another
comment for grammar and coding style.
Signed-off-by: Will Newton <will.newton@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/ipv4/tcp.c

@@ -344,8 +344,8 @@ unsigned int tcp_poll(struct file *file, struct socket *sock, poll_table *wait)
 		return inet_csk_listen_poll(sk);
 
 	/* Socket is not locked. We are protected from async events
-	   by poll logic and correct handling of state changes
-	   made by another threads is impossible in any case.
+	 * by poll logic and correct handling of state changes
+	 * made by other threads is impossible in any case.
 	 */
 
 	mask = 0;
@@ -371,10 +371,10 @@ unsigned int tcp_poll(struct file *file, struct socket *sock, poll_table *wait)
 	 * in state CLOSE_WAIT. One solution is evident --- to set POLLHUP
 	 * if and only if shutdown has been made in both directions.
 	 * Actually, it is interesting to look how Solaris and DUX
-	 * solve this dilemma. I would prefer, if PULLHUP were maskable,
+	 * solve this dilemma. I would prefer, if POLLHUP were maskable,
 	 * then we could set it on SND_SHUTDOWN. BTW examples given
 	 * in Stevens' books assume exactly this behaviour, it explains
-	 * why PULLHUP is incompatible with POLLOUT.	--ANK
+	 * why POLLHUP is incompatible with POLLOUT.	--ANK
 	 *
 	 * NOTE. Check for TCP_CLOSE is added. The goal is to prevent
 	 * blocking on fresh not-connected or disconnected socket. --ANK