Stop checking for valid handle in DevInfo.Close()

User should not have called or deferred the Close() method should
SetupDiGetClassDevsEx() return an error (and invalid handle). And even
if user does that, a SetupDiDestroyDeviceInfoList(INVALID_HANDLE_VALUE)
is harmless. It just returns ERROR_INVALID_HANDLE - we have a unit test
for this in TestSetupDiDestroyDeviceInfoList().

Signed-off-by: Simon Rozman <simon@rozman.si>

setupapi/types_windows.go

@@ -25,11 +25,7 @@ type DevInfo windows.Handle
 
 // Close function deletes a device information set and frees all associated memory.
 func (h DevInfo) Close() error {
-	if h != DevInfo(windows.InvalidHandle) {
-		return SetupDiDestroyDeviceInfoList(h)
-	}
-
-	return nil
+	return SetupDiDestroyDeviceInfoList(h)
 }
 
 const (