scsi: storvsc: remove return at end of void function

storvsc_on_channel_callback is a void function and the return
statement at the end is not useful.

Found with checkpatch.
Signed-off-by: Miguel Bernal Marin <miguel.bernal.marin@linux.intel.com>
Reviewed-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

drivers/scsi/storvsc_drv.c

@@ -1191,8 +1191,6 @@ static void storvsc_on_channel_callback(void *context)
 			break;
 		}
 	} while (1);
-
-	return;
 }
 
 static int storvsc_connect_to_vsp(struct hv_device *device, u32 ring_size,