xfs: cleanup log unmount handling

Kill the current xfs_log_unmount wrapper and opencode the two function
calls in the only caller.  Rename the current xfs_log_unmount_dealloc to
xfs_log_unmount as it undoes xfs_log_mount and the new name makes that
more clear.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Dave Chinner <david@fromorbit.com>
diff --git a/fs/xfs/xfs_mount.c b/fs/xfs/xfs_mount.c
index 664961e..2549a23 100644
--- a/fs/xfs/xfs_mount.c
+++ b/fs/xfs/xfs_mount.c
@@ -1194,7 +1194,7 @@
  out_rele_rip:
 	IRELE(rip);
  out_log_dealloc:
-	xfs_log_unmount_dealloc(mp);
+	xfs_log_unmount(mp);
  out_free_perag:
 	xfs_free_perag(mp);
  out_remove_uuid:
@@ -1280,7 +1280,8 @@
 				"Freespace may not be correct on next mount.");
 	xfs_unmountfs_writesb(mp);
 	xfs_unmountfs_wait(mp); 		/* wait for async bufs */
-	xfs_log_unmount(mp);			/* Done! No more fs ops. */
+	xfs_log_unmount_write(mp);
+	xfs_log_unmount(mp);
 
 	if ((mp->m_flags & XFS_MOUNT_NOUUID) == 0)
 		uuid_table_remove(&mp->m_sb.sb_uuid);