scsi: iscsi: Have abort handler get ref to conn

If SCSI midlayer is aborting a task when we are tearing down the conn we
could free the conn while the abort thread is accessing the conn. This has
the abort handler get a ref to the conn so it won't be freed from under it.

Note: this is not needed for device/target reset because we are holding the
eh_mutex when accessing the conn.

Link: https://lore.kernel.org/r/20210525181821.7617-12-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>

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