ALSA: hda - Optimize audio component check in patch_hdmi.c

The audio component is enabled only when CONFIG_SND_HDA_I915 is set.
Give a dummy macro for allowing the compiler optimize out the relevant
codes when this Kconfig isn't set.
Signed-off-by: Takashi Iwai <tiwai@suse.de>

sound/pci/hda/patch_hdmi.c

@@ -152,8 +152,12 @@ struct hdmi_spec {
 	struct i915_audio_component_audio_ops i915_audio_ops;
 };
 
+#ifdef CONFIG_SND_HDA_I915
 #define codec_has_acomp(codec) \
 	((codec)->bus->core.audio_component != NULL)
+#else
+#define codec_has_acomp(codec)	false
+#endif
 
 struct hdmi_audio_infoframe {
 	u8 type; /* 0x84 */