qga-win32: Fix memory leak of device information set

The caller of SetupDiGetClassDevs must delete the returned device information
 set when it is no longer needed by calling SetupDiDestroyDeviceInfoList.

Signed-off-by: Li Ping <li.ping288@zte.com.cn>
Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>

qga/commands-win32.c

@@ -512,7 +512,7 @@ static GuestPCIAddress *get_pci_info(char *guid, Error **errp)
             } else {
                 error_setg_win32(errp, GetLastError(),
                         "failed to get device name");
-                goto out;
+                goto free_dev_info;
             }
         }
 
@@ -560,6 +560,9 @@ static GuestPCIAddress *get_pci_info(char *guid, Error **errp)
         pci->bus = bus;
         break;
     }
+
+free_dev_info:
+    SetupDiDestroyDeviceInfoList(dev_info);
 out:
     g_free(buffer);
     g_free(name);