scsi: lpfc: Fix dynamic fw log enablement check

The recently posted patch had a typo that incorrectly tested the receiving
function.

Fix the typo (change == to !=)

Fixes: 95bfc6d8

 ("scsi: lpfc: Make FW logging dynamically configurable")
Link: https://lore.kernel.org/r/20191105005708.7399-6-jsmart2021@gmail.com
Signed-off-by: Dick Kennedy <dick.kennedy@broadcom.com>
Signed-off-by: James Smart <jsmart2021@gmail.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>