[PATCH] xfs_repair: validate inode di_flaaags field

[Alex Elder]

(I may have missed it, but I don't believe Dave posted
this patch so I'm doing it for him to get it on the
list.  -Alex)

xfs-reapir is not validating the di_flags field in the inode for
sanity. Block fuzzing indicates that we are not picking situations
like the RT bit being set on filesystems without realtime devices.
    
Signed-off-by: Dave Chinner <dchinner at redhat.com>