xfs: fold xfs_change_file_space into xfs_ioc_space

Now that only one caller of xfs_change_file_space is left it can be merged
into said caller.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Signed-off-by: Ben Myers <bpm@sgi.com>

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

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

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

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