[PATCH] ASoC: cs35l56: Fix wrong error test on simple_write_to_buffer()

[Richard Fitzgerald <rf@opensource.cirrus.com>]

In cs35l56_cal_data_debugfs_write() fix the if statement that checks for
error return to only check for negative values.

Reported by Sashiko:

  simple_write_to_buffer() returns the positive number of bytes copied
  on success. Since the condition returns immediately on any non-zero
  value, is it possible that the written calibration data is discarded
  and cs35l56_stash_calibration() is never called?

Fixes: f7097161e94c ("ASoC: cs35l56: Add common code for factory calibration")
Reported-by: Sashiko <sashiko-bot@kernel.org>
Link: https://sashiko.dev/#/patchset/20260610093432.557375-1-rf%40opensource.cirrus.com
Signed-off-by: Richard Fitzgerald <rf@opensource.cirrus.com>
---
Mark,

for-next
This is low priority.

 sound/soc/codecs/cs35l56-shared.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/sound/soc/codecs/cs35l56-shared.c b/sound/soc/codecs/cs35l56-shared.c
index d9f237bf8168..f14e2eaaa4ee 100644
--- a/sound/soc/codecs/cs35l56-shared.c
+++ b/sound/soc/codecs/cs35l56-shared.c
@@ -1260,7 +1260,7 @@ ssize_t cs35l56_cal_data_debugfs_write(struct cs35l56_base *cs35l56_base,
 		return -EMSGSIZE;
 
 	ret = simple_write_to_buffer(&cal_data, sizeof(cal_data), ppos, from, count);
-	if (ret)
+	if (ret < 0)
 		return ret;
 
 	ret = cs35l56_stash_calibration(cs35l56_base, &cal_data);
-- 
2.47.3