Fix a few warnings when using -Wextra

I didn't check in detail, but I think they are all harmless.

2 files changed, 4 insertions, 3 deletions

diff --git a/pwm-internal.h b/pwm-internal.h
index c63edd4..0489aaa 100644
--- a/pwm-internal.h
+++ b/pwm-internal.h
@@ -7,7 +7,7 @@
 	(type *)((void *)(ptr) - __builtin_offsetof(type, member)); })
 
 struct pwm_chip {
-	int npwm;
+	unsigned int npwm;
 	void (*close)(struct pwm_chip *chip);
 	struct pwm *(*get_pwm)(struct pwm_chip *chip, unsigned int offset);
 	int (*apply_state)(struct pwm *pwm, const struct pwm_state *state);
diff --git a/sysfs.c b/sysfs.c
index 4b543ed..ee7346c 100644
--- a/sysfs.c
+++ b/sysfs.c
@@ -36,7 +36,7 @@ struct pwm_chip_sysfs {
 
 static void pwm_chip_sysfs_close(struct pwm_chip *chip)
 {
-	int i;
+	unsigned int i;
 	struct pwm_chip_sysfs *chip_sysfs = container_of(chip, struct pwm_chip_sysfs, chip);
 
 	for (i = 0; i < chip->npwm; ++i) {
@@ -236,6 +236,7 @@ static int pwm_chip_sysfs_apply_state(struct pwm *pwm,
 
 static int pwm_chip_sysfs_get_state(struct pwm *pwm, struct pwm_state *state)
 {
+	(void)pwm; (void)state;
 	errno = EIO;
 	return -1;
 }
@@ -252,7 +253,7 @@ struct pwm_chip *pwm_chip_sysfs_open_by_number(unsigned int num)
 	ret = snprintf(buf, sizeof(buf), "/sys/class/pwm/pwmchip%d", num);
 	if (ret < 0)
 		return NULL;
-	if (ret >= sizeof(buf)) {
+	if ((size_t)ret >= sizeof(buf)) {
 		/* huh */
 		errno = EINVAL;
 		return NULL;