backlight: Fix copy/paste error printing an unrelated error code
udev_device_get_sysattr_value returns NULL on failure, but doesn't provide an error code; thus, when printing an error from it, don't print an unrelated error code from a previous call.
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@ -322,7 +322,7 @@ int main(int argc, char *argv[]) {
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value = udev_device_get_sysattr_value(device, "brightness");
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if (!value) {
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log_error("Failed to read system attribute: %s", strerror(-r));
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log_error("Failed to read system attribute");
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return EXIT_FAILURE;
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}
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