staging: vc04_services: remove unnecessary NULL check

We ensured that "service" as non-NULL in the previous if statement so
there is no need to check again here.

Signed-off-by: Dan Carpenter <[e-mail]>
Reviewed-by: Umang Jain <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

drivers/staging/vc04_services/interface/vchiq_arm/vchiq_core.c

···
 			continue;
 		}
 
-		svc_fourcc = service ? service->base.fourcc
-				     : VCHIQ_MAKE_FOURCC('?', '?', '?', '?');
+		svc_fourcc = service->base.fourcc;
 
 		vchiq_log_trace(state->dev, VCHIQ_SYNC,
 				"Rcvd Msg %s from %p4cc s:%d d:%d len:%d",