ALSA: hda - Use a macro for snd_array iteration loops

Introduce a new helper macro, snd_array_for_each(), to iterate for
each snd_array element.  It slightly improves the readability than
lengthy open codes at each place.

Along with it, add const prefix to some obvious places.

There should be no functional changes by this.

Signed-off-by: Takashi Iwai <tiwai@suse.de>

include/sound/hdaudio.h

@@ -571,4 +571,9 @@ static inline unsigned int snd_array_index(struct snd_array *array, void *ptr)
 	return (unsigned long)(ptr - array->list) / array->elem_size;
 }
 
+/* a helper macro to iterate for each snd_array element */
+#define snd_array_for_each(array, idx, ptr) \
+	for ((idx) = 0, (ptr) = (array)->list; (idx) < (array)->used; \
+	     (ptr) = snd_array_elem(array, ++(idx)))
+
 #endif /* __SOUND_HDAUDIO_H */