[GFS2] Remove support for unused and pointless flag

The ability to mark files for direct i/o access when opened
normally is both unused and pointless, so this patch removes
support for that feature.

Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>

fs/gfs2/super.c

@@ -65,7 +65,6 @@ void gfs2_tune_init(struct gfs2_tune *gt)
 	gt->gt_quota_quantum = 60;
 	gt->gt_atime_quantum = 3600;
 	gt->gt_new_files_jdata = 0;
-	gt->gt_new_files_directio = 0;
 	gt->gt_max_readahead = 1 << 18;
 	gt->gt_stall_secs = 600;
 	gt->gt_complain_secs = 10;