ASoC: soc: msm: initialize buffer to prevent kernel data leakage

To prevent potential kernel stack data leakage, initialize
channel_map[].

CRs-Fixed: 1100878
Bug: 35394329
Change-Id: I7b81cea20485bc7514551672bb54c7fd455049e3
Signed-off-by: Xiaojun Sang <xsang@codeaurora.org>

sound/soc/msm/qdsp6v2/msm-qti-pp-config.c

@@ -469,7 +469,7 @@ static int msm_qti_pp_set_auxpcm_lb_vol_mixer(struct snd_kcontrol *kcontrol,
 static int msm_qti_pp_get_channel_map_mixer(struct snd_kcontrol *kcontrol,
 					    struct snd_ctl_elem_value *ucontrol)
 {
-	char channel_map[PCM_FORMAT_MAX_NUM_CHANNEL];
+	char channel_map[PCM_FORMAT_MAX_NUM_CHANNEL] = {0};
 	int i;
 
 	adm_get_multi_ch_map(channel_map, ADM_PATH_PLAYBACK);