Staging: hv: netvsc_drv: Get rid of unused state in struct netvsc_driver

In preparation to getting rid of struct netvsc_driver, get rid of the
unused state (void *ctx)  in struct netvsc_driver.

Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: Haiyang Zhang <haiyangz@microsoft.com>
Signed-off-by: Abhishek Kane <v-abkane@microsoft.com>
Signed-off-by: Hank Janssen <hjanssen@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/staging/hv/hyperv_net.h

@@ -101,7 +101,6 @@ struct netvsc_driver {
 	/* Specific to this driver */
 	int (*send)(struct hv_device *dev, struct hv_netvsc_packet *packet);
 
-	void *ctx;
 };
 
 static inline