Staging: hv: Get rid of unnecessary state from struct storvsc_driver

This is unused state; get rid of it.
Signed-off-by: NK. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: NHaiyang Zhang <haiyangz@microsoft.com>
Signed-off-by: NAbhishek Kane <v-abkane@microsoft.com>
Signed-off-by: NHank Janssen <hjanssen@microsoft.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>

drivers/staging/hv/storvsc_api.h

@@ -83,9 +83,6 @@ struct storvsc_driver {
 	/* Maximum # of requests in flight per channel/device */
 	u32 max_outstanding_req_per_channel;
 
-	/* Specific to this driver */
-	int (*on_io_request)(struct hv_device *device,
-			   struct hv_storvsc_request *request);
 };
 
 struct storvsc_device_info {