ASoC: cs35l56: Initialise a variable to silence possible static analysis error

read_poll_timeout() is a macro and val will be populated before use,
however some static analysis tools treat it as a function and warn of
uninitialised variable usage.
Signed-off-by: Simon Trimmer <simont@opensource.cirrus.com>
Signed-off-by: Richard Fitzgerald <rf@opensource.cirrus.com>
Link: https://lore.kernel.org/r/20231004144203.151775-1-rf@opensource.cirrus.comSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/codecs/cs35l56-shared.c

@@ -242,7 +242,7 @@ EXPORT_SYMBOL_NS_GPL(cs35l56_firmware_shutdown, SND_SOC_CS35L56_SHARED);
 int cs35l56_wait_for_firmware_boot(struct cs35l56_base *cs35l56_base)
 {
 	unsigned int reg;
-	unsigned int val;
+	unsigned int val = 0;
 	int read_ret, poll_ret;
 
 	if (cs35l56_base->rev < CS35L56_REVID_B0)