xfs: move the guts of XFS_ERRORTAG_DELAY out of line

xfs: move the guts of XFS_ERRORTAG_DELAY out of line

Mirror what is done for the more common XFS_ERRORTAG_TEST version,
and also only look at the error tag value once now that we can
easily have a local variable.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Hans Holmberg <hans.holmberg@wdc.com>
Reviewed-by: Carlos Maiolino <cmaiolino@redhat.com>
Reviewed-by: Darrick J. Wong <djwong@kernel.org>
Signed-off-by: Carlos Maiolino <cem@kernel.org>