Drivers: hv: vmbus: Initialize request offers message for Isolation VM

Initialize memory of request offers message to be sent to the host so
padding or uninitialized fields do not leak guest memory contents.

Signed-off-by: Juan Vazquez <juvazq@linux.microsoft.com>
Link: https://lore.kernel.org/r/20220105192746.23046-1-juvazq@linux.microsoft.com
Signed-off-by: Wei Liu <wei.liu@kernel.org>

drivers/hv/channel_mgmt.c

@@ -1554,7 +1554,7 @@ int vmbus_request_offers(void)
 	struct vmbus_channel_msginfo *msginfo;
 	int ret;
 
-	msginfo = kmalloc(sizeof(*msginfo) +
+	msginfo = kzalloc(sizeof(*msginfo) +
 			  sizeof(struct vmbus_channel_message_header),
 			  GFP_KERNEL);
 	if (!msginfo)