ASoC: use int type to store negative error codes

Merge series from Qianfeng Rong <[e-mail]>:

The 'ret' variable usually is used to store returns from some functions,
which return either zero on success or negative error codes on failure.

Storing the negative error codes in unsigned type, doesn't cause an issue
at runtime but it's ugly as pants. Additionally, assigning negative error
codes to unsigned type may trigger a GCC warning when the -Wsign-conversion
flag is enabled.

Change "ret" from u32/unsigned int to int type. No effect on runtime.

sound/soc/amd/acp/acp-rembrandt.c

···
 {
 	struct device *dev = &pdev->dev;
 	struct acp_chip_info *chip;
-	u32 ret;
+	int ret;
 
 	chip = dev_get_platdata(&pdev->dev);
 	if (!chip || !chip->base) {

sound/soc/amd/raven/acp3x-i2s.c

···
 				int cmd, struct snd_soc_dai *dai)
 {
 	struct i2s_stream_instance *rtd;
-	u32 ret, val, period_bytes, reg_val, ier_val, water_val;
+	u32 val, period_bytes, reg_val, ier_val, water_val;
 	u32 buf_size, buf_reg;
+	int ret;
 
 	rtd = substream->runtime->private_data;
 	period_bytes = frames_to_bytes(substream->runtime,

sound/soc/amd/vangogh/acp5x-i2s.c

···
 {
 	struct i2s_stream_instance *rtd;
 	struct i2s_dev_data *adata;
-	u32 ret, val, period_bytes, reg_val, ier_val, water_val;
+	u32 val, period_bytes, reg_val, ier_val, water_val;
 	u32 buf_size, buf_reg;
+	int ret;
 
 	adata = snd_soc_dai_get_drvdata(dai);
 	rtd = substream->runtime->private_data;

sound/soc/codecs/adau1977.c

···
 	struct adau1977 *adau1977 = snd_soc_component_get_drvdata(component);
 	unsigned int mask = 0;
 	unsigned int clk_src;
-	unsigned int ret;
+	int ret;
 
 	if (dir != SND_SOC_CLOCK_IN)
 		return -EINVAL;

sound/soc/qcom/lpass-cdc-dma.c

···
 {
 	struct snd_soc_pcm_runtime *soc_runtime = snd_soc_substream_to_rtd(substream);
 	struct lpaif_dmactl *dmactl = NULL;
-	unsigned int ret, regval;
+	unsigned int regval;
 	unsigned int channels = params_channels(params);
+	int ret;
 	int id;
 
 	switch (channels) {

sound/soc/qcom/lpass-hdmi.c

···
 	snd_pcm_format_t format = params_format(params);
 	unsigned int rate = params_rate(params);
 	unsigned int channels = params_channels(params);
-	unsigned int ret;
 	int bitwidth;
 	unsigned int word_length;
 	unsigned int ch_sts_buf0;
···
 	unsigned int ch = 0;
 	struct lpass_dp_metadata_ctl *meta_ctl = drvdata->meta_ctl;
 	struct lpass_sstream_ctl *sstream_ctl = drvdata->sstream_ctl;
+	int ret;
 
 	bitwidth = snd_pcm_format_width(format);
 	if (bitwidth < 0) {