ALSA: hda: cs35l41: Do not allow uninitialised variables to be freed

Initialise the variables to NULL so that they cannot be uninitialised
when devm_kfree is called.

Found by static analysis.

Fixes: 8c4c216d ("ALSA: hda: cs35l41: Add config table to support many laptops without _DSD")
Signed-off-by: Stefan Binding <sbinding@opensource.cirrus.com>
Link: https://lore.kernel.org/r/20231219162232.790358-2-sbinding@opensource.cirrus.comSigned-off-by: Takashi Iwai <tiwai@suse.de>

sound/pci/hda/cs35l41_hda_property.c

@@ -77,10 +77,10 @@ static const struct cs35l41_config cs35l41_config_table[] = {
 static int cs35l41_add_gpios(struct cs35l41_hda *cs35l41, struct device *physdev, int reset_gpio,
 			     int spkid_gpio, int cs_gpio_index, int num_amps)
 {
-	struct acpi_gpio_mapping *gpio_mapping;
-	struct acpi_gpio_params *reset_gpio_params;
-	struct acpi_gpio_params *spkid_gpio_params;
-	struct acpi_gpio_params *cs_gpio_params;
+	struct acpi_gpio_mapping *gpio_mapping = NULL;
+	struct acpi_gpio_params *reset_gpio_params = NULL;
+	struct acpi_gpio_params *spkid_gpio_params = NULL;
+	struct acpi_gpio_params *cs_gpio_params = NULL;
 	unsigned int num_entries = 0;
 	unsigned int reset_index, spkid_index, csgpio_index;
 	int i;