drivers: display_st7567: Fix unintialized variable warning

anangl · kartben · commit fee8eddc5baa · 2025-05-06T20:36:37.000+02:00
Theoretically (if either `height` or `width` in `config` is set to 0),
the `ret` variable might be returned from `st7567_clear()` without
being initialized.
Add initialization of this variable to avoid compiler warnings.

Signed-off-by: Andrzej Głąbek &lt;andrzej.glabek@nordicsemi.no&gt;
diff --git a/drivers/display/display_st7567.c b/drivers/display/display_st7567.c
@@ -338,7 +338,7 @@ static int st7567_reset(const struct device *dev)
 static int st7567_clear(const struct device *dev)
 {
 	const struct st7567_config *config = dev->config;
-	int ret;
+	int ret = 0;
 	uint8_t buf = 0;
 
 	uint8_t cmd_buf[] = {

Original file line number	Diff line number	Diff line change
`@@ -338,7 +338,7 @@ static int st7567_reset(const struct device *dev)`
`338`	`338`	`static int st7567_clear(const struct device *dev)`
`339`	`339`	`{`
`340`	`340`	`const struct st7567_config *config = dev->config;`
`341`		`- int ret;`
	`341`	`+ int ret = 0;`
`342`	`342`	`uint8_t buf = 0;`
`343`	`343`
`344`	`344`	`uint8_t cmd_buf[] = {`