ipmi:ipmb: Fix a vague comment and a typo

Sending an IPMI response message gets a reponse to the response, but the
comment saying that just said "response response", which is hard to
understand. Also fix an obvious typo.

Reported-by: Shaomin Deng <[e-mail]>
Signed-off-by: Corey Minyard <[e-mail]>

drivers/char/ipmi/ipmi_ipmb.c

···
 {
 	if ((msg->data[0] >> 2) & 1) {
 		/*
-		 * It's a response being sent, we needto return a
-		 * response response.  Fake a send msg command
+		 * It's a response being sent, we need to return a
+		 * response to the response.  Fake a send msg command
 		 * response with channel 0.  This will always be ipmb
 		 * direct.
 		 */