[SCSI] be2iscsi: fix null ptr when accessing task hdr
If alloc_pdu fails then the task->hdr pointer may not be set. This adds a check for this case in the cleanup callback. Signed-off-by: NMike Christie <michaelc@cs.wisc.edu> Signed-off-by: NJames Bottomley <James.Bottomley@suse.de>
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