IB/rxe: Another fix for broken receive queue draining

This fixes another path in rxe_requester() that might overlook stale SKBs,
preventing cleanup.

Fixes: 12171971

 ("rxe: fix broken receive queue draining")
Signed-off-by: Andrew Boyer <andrew.boyer@dell.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>