xfs: merge xfs_inode_flush into xfs_fs_write_inode

Splitting the task for a VFS-induced inode flush into two functions doesn't
make any sense, so merge the two functions dealing with it.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Felix Blyakher <felixb@sgi.com>
Reviewed-by: Dave Chinner <david@fromorbit.com>

diff --cc fs/xfs/linux-2.6/xfs_super.c
Simple merge

diff --cc fs/xfs/linux-2.6/xfs_vnode.h
Simple merge

diff --cc fs/xfs/xfs_vnodeops.c
Simple merge

diff --cc fs/xfs/xfs_vnodeops.h
Simple merge