ASoC: SOF: core: fix undefined nocodec reference

The existing code mistakenly uses IS_ENABLED in C code instead of as
in conditional compilation, leading to the following error:

ld: sound/soc/sof/core.o: in function `sof_machine_check':
sound/soc/sof/core.c:279: undefined reference to `sof_nocodec_setup'

Fix by using #if !IS_ENABLED()
Reported-by: Nkbuild test robot <lkp@intel.com>
Signed-off-by: NPierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Signed-off-by: NMark Brown <broonie@kernel.org>

sound/soc/sof/core.c

@@ -265,11 +265,10 @@ static int sof_machine_check(struct snd_sof_dev *sdev)
 	if (plat_data->machine)
 		return 0;
 
-	if (!IS_ENABLED(CONFIG_SND_SOC_SOF_NOCODEC)) {
-		dev_err(sdev->dev, "error: no matching ASoC machine driver found - aborting probe\n");
-		return -ENODEV;
-	}
-
+#if !IS_ENABLED(CONFIG_SND_SOC_SOF_NOCODEC)
+	dev_err(sdev->dev, "error: no matching ASoC machine driver found - aborting probe\n");
+	return -ENODEV;
+#else
 	/* fallback to nocodec mode */
 	dev_warn(sdev->dev, "No ASoC machine driver found - using nocodec\n");
 	machine = devm_kzalloc(sdev->dev, sizeof(*machine), GFP_KERNEL);
@@ -284,6 +283,7 @@ static int sof_machine_check(struct snd_sof_dev *sdev)
 	plat_data->machine = machine;
 
 	return 0;
+#endif
 }
 
 static int sof_probe_continue(struct snd_sof_dev *sdev)