ASoC: codecs: lpass-rx-macro: Fix uninitialized variable ec_tx

There is potential read of the uninitialized variable ec_tx if the call
to snd_soc_component_read fails or returns an unrecognized w->name. To
avoid this corner case, initialize ec_tx to -1 so that it is caught
later when ec_tx is bounds checked.

Addresses-Coverity: ("Uninitialized scalar variable")
Fixes: 4f692926 ("ASoC: codecs: lpass-rx-macro: add dapm widgets and route")
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Link: https://lore.kernel.org/r/20210215163313.84026-1-colin.king@canonical.comSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/codecs/lpass-rx-macro.c

@@ -2895,7 +2895,7 @@ static int rx_macro_enable_echo(struct snd_soc_dapm_widget *w,
 {
 	struct snd_soc_component *component = snd_soc_dapm_to_component(w->dapm);
 	u16 val, ec_hq_reg;
-	int ec_tx;
+	int ec_tx = -1;
 
 	val = snd_soc_component_read(component,
 			CDC_RX_INP_MUX_RX_MIX_CFG4);