scsi: libfc: trivial: Fix spelling mistake of 'discovery'

This is my fault (can't even blame copy/paste).

Link: https://lore.kernel.org/r/20200713074645.126138-4-lee.jones@linaro.org


Cc: Hannes Reinecke <hare@suse.de>
Reported-by: Johannes Thumshirn <Johannes.Thumshirn@wdc.com>
Reviewed-by: Hannes Reinecke <hare@suse.de>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>