Drivers: hv: vmbus: Set ring_info field to 0 and remove memset

Set "ring_info->priv_read_index" to 0. Now, all of ring_info's fields
are explicitly set in this function. The memset() call is no longer
necessary, so remove it.
Signed-off-by: Kimberly Brown <kimbrownkd@gmail.com>
Reviewed-by: Michael Kelley <mikelley@microsoft.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

drivers/hv/ring_buffer.c

@@ -197,8 +197,6 @@ int hv_ringbuffer_init(struct hv_ring_buffer_info *ring_info,
 
 	BUILD_BUG_ON((sizeof(struct hv_ring_buffer) != PAGE_SIZE));
 
-	memset(ring_info, 0, sizeof(struct hv_ring_buffer_info));
-
 	/*
 	 * First page holds struct hv_ring_buffer, do wraparound mapping for
 	 * the rest.
@@ -232,6 +230,7 @@ int hv_ringbuffer_init(struct hv_ring_buffer_info *ring_info,
 		reciprocal_value(ring_info->ring_size / 10);
 	ring_info->ring_datasize = ring_info->ring_size -
 		sizeof(struct hv_ring_buffer);
+	ring_info->priv_read_index = 0;
 
 	spin_lock_init(&ring_info->ring_lock);