scsi: be2iscsi: Fix a memory leak in beiscsi_boot_get_sinfo()

If nonemb_cmd->va fails to be allocated, free the allocation previously
made by alloc_mcc_wrb().

Fixes: 50a4b824be9e ("scsi: be2iscsi: Fix to make boot discovery non-blocking")
Cc: [e-mail]
Signed-off-by: Haoxiang Li <[e-mail]>
Link: https://patch.msgid.link/[e-mail]
Signed-off-by: Martin K. Petersen <[e-mail]>

drivers/scsi/be2iscsi/be_mgmt.c

···
 					      &nonemb_cmd->dma,
 					      GFP_KERNEL);
 	if (!nonemb_cmd->va) {
+		free_mcc_wrb(ctrl, tag);
 		mutex_unlock(&ctrl->mbox_lock);
 		return 0;
 	}