Sasha Levin 0174b381ca IB/ucma: check workqueue allocation before usage
Allocating a workqueue might fail, which wasn't checked so far and would
lead to NULL ptr derefs when an attempt to use it was made.

Signed-off-by: Sasha Levin <sasha.levin@oracle.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>
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