[fix] Only update err if return code is non-zero

setup/so-functions

@@ -889,7 +889,7 @@ configure_network_sensor() {
 	for BNIC in "${BNICS[@]}"; do
 		add_interface_bond0 "$BNIC" >> "$setup_log" 2>&1
 		local ret=$?
-		[[ $ret ]] || err=$ret
+		[[ $ret -eq 0 ]] || err=$ret
 	done
 	return $err
 }