ALSA: lx_core: use int type to store negative error codes

[ Upstream commit 4ef353d546cda466fc39b7daca558d7bcec21c09 ]

Change the 'ret' variable from u16 to int to store negative error codes or
zero returned by lx_message_send_atomic().

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.

No effect on runtime.

Fixes: 02bec49 ("ALSA: lx6464es - driver for the digigram lx6464es interface")
Signed-off-by: Qianfeng Rong <rongqianfeng@vivo.com>
Link: https://patch.msgid.link/20250828081312.393148-1-rongqianfeng@vivo.com
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Ulrich Hecht <uli@kernel.org>

Author: qianfengrong

sound/pci/lx6464es/lx_core.c

@@ -331,7 +331,7 @@ static int lx_message_send_atomic(struct lx6464es *chip, struct lx_rmh *rmh)
 /* low-level dsp access */
 int lx_dsp_get_version(struct lx6464es *chip, u32 *rdsp_version)
 {
-	u16 ret;
+	int ret;
 
 	mutex_lock(&chip->msg_lock);
 
@@ -345,10 +345,10 @@ int lx_dsp_get_version(struct lx6464es *chip, u32 *rdsp_version)
 
 int lx_dsp_get_clock_frequency(struct lx6464es *chip, u32 *rfreq)
 {
-	u16 ret = 0;
 	u32 freq_raw = 0;
 	u32 freq = 0;
 	u32 frequency = 0;
+	int ret;
 
 	mutex_lock(&chip->msg_lock);