gfs2: Fixup to "Get rid of flush_delayed_work in gfs2_evict_inode"

When commit 4fd1a579 moved the call to flush_delayed_work from
gfs2_evict_inode to gfs2_inode_lookup to avoid calling into DLM during
evict, a similar call should have been added to gfs2_create_inode:
that's another code path in which glocks of previous inodes may be
reused.

The flush of the iopen glock work queue added by 4fd1a579

, on the
other hand, is unnecessary and can be removed.

Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
Signed-off-by: Bob Peterson <rpeterso@redhat.com>