Brightness (FreeBSD): fix backlight name detection

Author: CarterLi

src/detection/brightness/brightness_bsd.c

@@ -34,7 +34,7 @@ const char* ffDetectBrightness(FF_MAYBE_UNUSED FFBrightnessOptions* options, FFl
         brightness->current = status.brightness;
 
         struct backlight_info info;
-        if(ioctl(blfd, BACKLIGHTGETINFO, &info) < 0)
+        if(ioctl(blfd, BACKLIGHTGETINFO, &info) == 0)
             ffStrbufAppendS(&brightness->name, info.name);
         else
             ffStrbufAppendS(&brightness->name, path + strlen("/dev/backlight/"));