xfs: Check error during inode btree iteration in xfs_bulkstat()

xfs: Check error during inode btree iteration in xfs_bulkstat()

commit 7a19dee116c8fae7ba7a778043c245194289f5a2 upstream.

xfs_bulkstat() doesn't check error return from xfs_btree_increment(). In
case of specific fs corruption that could result in xfs_bulkstat()
entering an infinite loop because we would be looping over the same
chunk over and over again. Fix the problem by checking the return value
and terminating the loop properly.

Coverity-id: 1231338
Signed-off-by: Jan Kara <jack@suse.cz>
Reviewed-by: Jie Liu <jeff.u.liu@gmail.com>
Signed-off-by: Dave Chinner <david@fromorbit.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>