PCI: hv: Handle vmbus_sendpacket() failure in hv_compose_msi_msg()

Handle vmbus_sendpacket() failure in hv_compose_msi_msg().

I happened to find this when reading the code.  I didn't get a real issue
however.

Signed-off-by: Dexuan Cui <[email protected]>
Signed-off-by: Bjorn Helgaas <[email protected]>
Acked-by: KY Srinivasan <[email protected]>
CC: Jake Oshins <[email protected]>
CC: Haiyang Zhang <[email protected]>
CC: Vitaly Kuznetsov <[email protected]>

Author: dcui

drivers/pci/host/pci-hyperv.c

@@ -895,8 +895,10 @@ static void hv_compose_msi_msg(struct irq_data *data, struct msi_msg *msg)
 			       sizeof(*int_pkt), (unsigned long)&ctxt.pkt,
 			       VM_PKT_DATA_INBAND,
 			       VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
-	if (!ret)
-		wait_for_completion(&comp.comp_pkt.host_event);
+	if (ret)
+		goto free_int_desc;
+
+	wait_for_completion(&comp.comp_pkt.host_event);
 
 	if (comp.comp_pkt.completion_status < 0) {
 		dev_err(&hbus->hdev->device,