If CONFIG_SCSI_MPT2SAS_LOGGING is undefined, then these warnings are emitted:

drivers/scsi/mpt2sas/mpt2sas_scsih.c: In function 
'_scsih_sas_broadcast_primitive_event':
drivers/scsi/mpt2sas/mpt2sas_scsih.c:5810:40: warning: unused variable 
'event_data' [-Wunused-variable]

Add __maybe_unused to the definition of event_data.

Cc: Nagalakshmi Nandigama <[email protected]>
Cc: Sreekanth Reddy <[email protected]>
Cc: [email protected]
Cc: "James E.J. Bottomley" <[email protected]>
Cc: [email protected]
Cc: [email protected]
Signed-off-by: Tim Gardner <[email protected]>
---
 drivers/scsi/mpt2sas/mpt2sas_scsih.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/scsi/mpt2sas/mpt2sas_scsih.c 
b/drivers/scsi/mpt2sas/mpt2sas_scsih.c
index c6bdc92..416f907 100644
--- a/drivers/scsi/mpt2sas/mpt2sas_scsih.c
+++ b/drivers/scsi/mpt2sas/mpt2sas_scsih.c
@@ -5807,7 +5807,8 @@ _scsih_sas_broadcast_primitive_event(struct 
MPT2SAS_ADAPTER *ioc,
        u32 termination_count;
        u32 query_count;
        Mpi2SCSITaskManagementReply_t *mpi_reply;
-       Mpi2EventDataSasBroadcastPrimitive_t *event_data = fw_event->event_data;
+       Mpi2EventDataSasBroadcastPrimitive_t *event_data __maybe_unused =
+               fw_event->event_data;
        u16 ioc_status;
        unsigned long flags;
        int r;
-- 
1.7.9.5

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