scsi: fnic: Remove a useless struct mempool forward declaration

struct mempool doesn't currently exist, and thus also isn't used in
fnic.h, remove it.

Signed-off-by: Christoph Hellwig <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Reviewed-by: Karan Tilak Kumar <[email protected]>
Signed-off-by: Martin K. Petersen <[email protected]>

Author: Christoph Hellwig

drivers/scsi/fnic/fnic.h

@@ -323,8 +323,6 @@ enum fnic_state {
 	FNIC_IN_ETH_TRANS_FC_MODE,
 };
 
-struct mempool;
-
 enum fnic_role_e {
 	FNIC_ROLE_FCP_INITIATOR = 0,
 };