ALSA: hda: cs35l41: fix double free on error in probe()

If we encounter an error after the kfree(acpi_hw_cfg); then the goto
err; will result in a double free.

Fixes: 7b2f3eb4 ("ALSA: hda: cs35l41: Add support for CS35L41 in HDA systems")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Link: https://lore.kernel.org/r/20220111072232.GG11243@kiliSigned-off-by: Takashi Iwai <tiwai@suse.de>

sound/pci/hda/cs35l41_hda.c

@@ -477,6 +477,7 @@ int cs35l41_hda_probe(struct device *dev, const char *device_name, int id, int i
 	if (ret)
 		goto err;
 	kfree(acpi_hw_cfg);
+	acpi_hw_cfg = NULL;
 
 	if (cs35l41->reg_seq->probe) {
 		ret = regmap_register_patch(cs35l41->regmap, cs35l41->reg_seq->probe,