IB/srp: Stop the scsi_eh_<n> and scsi_tmf_<n> threads if login fails

IB/srp: Stop the scsi_eh_<n> and scsi_tmf_<n> threads if login fails

scsi_host_alloc() not only allocates memory for a SCSI host but also
creates the scsi_eh_<n> kernel thread and the scsi_tmf_<n> workqueue.
Stop these threads if login fails by calling scsi_host_put().

Reported-by: Konstantin Krotov <[email protected]>
Fixes: fb49c8bbaae7 ("Remove an extraneous scsi_host_put() from an error path")
Signed-off-by: Bart Van Assche <[email protected]>
Cc: Sagi Grimberg <[email protected]>
Cc: Sebastian Parschauer <[email protected]>
Cc: <[email protected]> #v3.19
Signed-off-by: Doug Ledford <[email protected]>