fff-layer3-config: show uci syntax errors

Do not hide uci errors when checking if gateway config exists, so an
appropriate uci error message is displayed. This can be helpful to find
syntax errors.

Signed-off-by: Fabian Bläse <fabian@blaese.de>
Reviewed-by: Christian Dresel <freifunk@dresel.systems>
Reviewed-by: Robert Langhammer <rlanghammer@web.de>

src/packages/fff/fff-layer3-config/files/etc/layer3.d/01-version

@@ -1,6 +1,6 @@
 configure() {
 	# check if gateway config exists
-	if ! uci -q show gateway > /dev/null; then
+	if ! uci show gateway > /dev/null; then
 		echo "ERROR: Gateway config could not be parsed or does not exist."
 
 		return 1