xpc_sn2: fix max() warning about pointers of different types

Fix a minor compile warning when building on ia64.

drivers/misc/sgi-xp/xpc_sn2.c: In function `xpc_clear_remote_msgqueue_flags_sn2':
drivers/misc/sgi-xp/xpc_sn2.c:1746: warning: comparison of distinct pointer types lacks a cast
Signed-off-by: Robin Holt <holt@sgi.com>
Cc: Sam Ravnborg <sam@ravnborg.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

drivers/misc/sgi-xp/xpc_sn2.c

@@ -1744,20 +1744,20 @@ xpc_clear_remote_msgqueue_flags_sn2(struct xpc_channel *ch)
 {
 	struct xpc_channel_sn2 *ch_sn2 = &ch->sn.sn2;
 	struct xpc_msg_sn2 *msg;
-	s64 put;
+	s64 put, remote_nentries = ch->remote_nentries;
 
 	/* flags are zeroed when the buffer is allocated */
-	if (ch_sn2->remote_GP.put < ch->remote_nentries)
+	if (ch_sn2->remote_GP.put < remote_nentries)
 		return;
 
-	put = max(ch_sn2->w_remote_GP.put, ch->remote_nentries);
+	put = max(ch_sn2->w_remote_GP.put, remote_nentries);
 	do {
 		msg = (struct xpc_msg_sn2 *)((u64)ch_sn2->remote_msgqueue +
-					     (put % ch->remote_nentries) *
+					     (put % remote_nentries) *
 					     ch->entry_size);
 		DBUG_ON(!(msg->flags & XPC_M_SN2_READY));
 		DBUG_ON(!(msg->flags & XPC_M_SN2_DONE));
-		DBUG_ON(msg->number != put - ch->remote_nentries);
+		DBUG_ON(msg->number != put - remote_nentries);
 		msg->flags = 0;
 	} while (++put < ch_sn2->remote_GP.put);
 }