scsi: storvsc: Fix error return in storvsc_probe()

Return -ENOMEM from the error handling case instead of 0.

Link: https://lore.kernel.org/r/20201127030206.104616-1-jingxiangfeng@huawei.com


Fixes: 436ad941 ("scsi: storvsc: Allow only one remove lun work item to be issued per lun")
Reviewed-by: Michael Kelley <mikelley@microsoft.com>
Signed-off-by: Jing Xiangfeng <jingxiangfeng@huawei.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>