backlight: Avoid passing an invalid fd into close()

diff --git a/src/libbacklight.c b/src/libbacklight.c
index add89b2..98a20be 100644 (file)
--- a/src/libbacklight.c
+++ b/src/libbacklight.c
@@ -68,7 +68,8 @@ static long backlight_get(struct backlight *backlight, char *node)
        value = strtol(buffer, NULL, 10);
        ret = value;
 out:
-       close(fd);
+       if (fd >= 0)
+               close(fd);
        free(path);
        return ret;
 }
@@ -124,10 +125,10 @@ long backlight_set_brightness(struct backlight *backlight, long brightness)
        ret = backlight_get_brightness(backlight);
        backlight->brightness = ret;
 out:
-       if (buffer)
-               free(buffer);
+       free(buffer);
        free(path);
-       close(fd);
+       if (fd >= 0)
+               close(fd);
        return ret;
 }