dm mpath: simplify __must_push_back
Remove micro-optimization that infers device is between presuspend and
resume (was done purely to avoid call to dm_noflush_suspending, which
isn't expensive anyway).
Remove flags argument since they are no longer checked.
And remove must_push_back_bio() since it was simply a call to
__must_push_back().
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
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