ceph: some endianity fixes

Fix some problems that came up with sparse.

Signed-off-by: Yehuda Sadeh <yehuda@hq.newdream.net>
Signed-off-by: Sage Weil <sage@newdream.net>
diff --git a/fs/ceph/auth_x.c b/fs/ceph/auth_x.c
index 83d4d27..3fe4904 100644
--- a/fs/ceph/auth_x.c
+++ b/fs/ceph/auth_x.c
@@ -493,7 +493,7 @@
 		return -EAGAIN;
 	}
 
-	op = le32_to_cpu(head->op);
+	op = le16_to_cpu(head->op);
 	result = le32_to_cpu(head->result);
 	dout("handle_reply op %d result %d\n", op, result);
 	switch (op) {