ASoC: tegra: Fix -Wuninitialized in tegra210_amx_platform_probe()

Clang warns (or errors with CONFIG_WERROR=y):

  sound/soc/tegra/tegra210_amx.c:553:10: error: variable 'soc_data' is uninitialized when used here [-Werror,-Wuninitialized]
    553 |                                             soc_data->regmap_conf);
        |                                             ^~~~~~~~

A refactoring removed the initialization of this variable but its use
was not updated. Use the soc_data value in the amx variable to resolve
the warning and remove the soc_data variable, as it is now entirely
unused.

Closes: https://github.com/ClangBuiltLinux/linux/issues/1943
Fixes: 9958d859 ("ASoC: Use device_get_match_data()")
Signed-off-by: Nathan Chancellor <nathan@kernel.org>
Link: https://lore.kernel.org/r/20231011-asoc-tegra-fix-uninit-soc_data-v1-1-0ef0ab44cf48@kernel.orgSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/tegra/tegra210_amx.c

@@ -535,7 +535,6 @@ static int tegra210_amx_platform_probe(struct platform_device *pdev)
 	struct tegra210_amx *amx;
 	void __iomem *regs;
 	int err;
-	struct tegra210_amx_soc_data *soc_data;
 
 	amx = devm_kzalloc(dev, sizeof(*amx), GFP_KERNEL);
 	if (!amx)
@@ -550,7 +549,7 @@ static int tegra210_amx_platform_probe(struct platform_device *pdev)
 		return PTR_ERR(regs);
 
 	amx->regmap = devm_regmap_init_mmio(dev, regs,
-					    soc_data->regmap_conf);
+					    amx->soc_data->regmap_conf);
 	if (IS_ERR(amx->regmap)) {
 		dev_err(dev, "regmap init failed\n");
 		return PTR_ERR(amx->regmap);