Drivers: hv: vmbus: Removed an unnecessary cast from void *

In C, we don't need such a cast.

Fixes: ae20b254306a ("Drivers: hv: vmbus: enable VMBus protocol version 5.0")
Reported-by: Stephen Hemminger <sthemmin@microsoft.com>
Signed-off-by: Dexuan Cui <decui@microsoft.com>
Cc: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/hv/connection.c

@@ -409,7 +409,7 @@ int vmbus_post_msg(void *buffer, size_t buflen, bool can_sleep)
 			 * HV_STATUS_INVALID_CONNECTION_ID and we should
 			 * return an error immediately without retrying.
 			 */
-			hdr = (struct vmbus_channel_message_header *)buffer;
+			hdr = buffer;
 			if (hdr->msgtype == CHANNELMSG_INITIATE_CONTACT)
 				return -EINVAL;
 			/*