ASoC: lochnagar: Fix unused lochnagar_of_match warning

lochnagar_of_match is used unconditionally, so COMPILE_TEST builds
without OF warn:

sound/soc/codecs/lochnagar-sc.c:247:34: error: ‘lochnagar_of_match’ defined but not used [-Werror=unused-const-variable=]

Reported-by: kernel test robot <[e-mail]>
Signed-off-by: Krzysztof Kozlowski <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Mark Brown <[e-mail]>

sound/soc/codecs/lochnagar-sc.c

···
 static struct platform_driver lochnagar_sc_codec_driver = {
 	.driver = {
 		.name = "lochnagar-soundcard",
-		.of_match_table = of_match_ptr(lochnagar_of_match),
+		.of_match_table = lochnagar_of_match,
 	},
 
 	.probe = lochnagar_sc_probe,