scsi: libiscsi: Fix iSCSI host workq destruction

We allocate the iSCSI host workq in iscsi_host_alloc() so iscsi_host_free()
should do the destruction. Drivers can then do their error/goto handling
and call iscsi_host_free() to clean up what has been allocated in
iscsi_host_alloc().

Link: https://lore.kernel.org/r/20210207044608.27585-5-michael.christie@oracle.com


Reviewed-by: Lee Duncan <lduncan@suse.com>
Signed-off-by: Mike Christie <michael.christie@oracle.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>