ASoC: mediatek: mt9195-mt6359: fix UNINIT problem

Coverity shows using uninitialized value monitor. When regmap_read
returns an error, monitor keeps the value left from earlier
computation. To prevent from the unexpected result in the case, assign
0 to monitor.
Signed-off-by: Trevor Wu <trevor.wu@mediatek.com>
Link: https://lore.kernel.org/r/20230307040938.7484-3-trevor.wu@mediatek.comSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/mediatek/mt8195/mt8195-mt6359.c

@@ -158,7 +158,7 @@ static int mt8195_mt6359_mtkaif_calibration(struct snd_soc_pcm_runtime *rtd)
 	int mtkaif_phase_cycle[MT8195_MTKAIF_MISO_NUM];
 	int mtkaif_calibration_num_phase;
 	bool mtkaif_calibration_ok;
-	unsigned int monitor;
+	unsigned int monitor = 0;
 	int counter;
 	int phase;
 	int i;