ASoC: Rename soc_enum.max field with items

The name "max" in struct soc_enum is rather confusing since it
actually takes the number of items.  With "max", one might try to
assign (nitems - 1) value.

Rename the field to a more appropriate one, "items", which is also
used in struct snd_ctl_elem_info, too.

This patch also rewrites some code like "if (x > e->nitems - 1)" with
"if (x >= e->nitems)".  Not only the latter improves the readability,
it also fixes a potential bug when e->items is zero.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
Acked-by: Liam Girdwood <liam.r.girdwood@linux.intel.com>
Acked-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Mark Brown <broonie@linaro.org>
diff --git a/sound/soc/codecs/max98088.c b/sound/soc/codecs/max98088.c
index ee660e2..bb1ecfc 100644
--- a/sound/soc/codecs/max98088.c
+++ b/sound/soc/codecs/max98088.c
@@ -1849,7 +1849,7 @@
 
        /* Now point the soc_enum to .texts array items */
        max98088->eq_enum.texts = max98088->eq_texts;
-       max98088->eq_enum.max = max98088->eq_textcnt;
+       max98088->eq_enum.items = max98088->eq_textcnt;
 
        ret = snd_soc_add_codec_controls(codec, controls, ARRAY_SIZE(controls));
        if (ret != 0)