xfs: remove i_transp

Remove the transaction pointer in the inode.  It's only used to avoid
passing down an argument in the bmap code, and for a few asserts in
the transaction code right now.

Also use the local variable ip in a few more places in xfs_inode_item_unlock,
so that it isn't only used for debug builds after the above change.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Alex Elder <aelder@sgi.com>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
diff --git a/fs/xfs/xfs_inode_item.c b/fs/xfs/xfs_inode_item.c
index b1e88d5..a49811a 100644
--- a/fs/xfs/xfs_inode_item.c
+++ b/fs/xfs/xfs_inode_item.c
@@ -632,13 +632,8 @@
 	struct xfs_inode	*ip = iip->ili_inode;
 	unsigned short		lock_flags;
 
-	ASSERT(iip->ili_inode->i_itemp != NULL);
-	ASSERT(xfs_isilocked(iip->ili_inode, XFS_ILOCK_EXCL));
-
-	/*
-	 * Clear the transaction pointer in the inode.
-	 */
-	ip->i_transp = NULL;
+	ASSERT(ip->i_itemp != NULL);
+	ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
 
 	/*
 	 * If the inode needed a separate buffer with which to log
@@ -664,8 +659,8 @@
 	lock_flags = iip->ili_lock_flags;
 	iip->ili_lock_flags = 0;
 	if (lock_flags) {
-		xfs_iunlock(iip->ili_inode, lock_flags);
-		IRELE(iip->ili_inode);
+		xfs_iunlock(ip, lock_flags);
+		IRELE(ip);
 	}
 }