fix unused variable in location service

Author: himanshu goyal

lib/core/services/location_services.dart

@@ -14,11 +14,17 @@ class LocationService {
   Position? get currentPosition => _currentPosition;
 
   Future<Position?> getCurrentLocation() async {
+    // ignore: unused_local_variable
     bool serviceEnabled;
+    // ignore: unused_local_variable
     LocationPermission permission;
 
     serviceEnabled = await Geolocator.isLocationServiceEnabled();
 
+    if (!serviceEnabled) {
+      return Future.error('Location service is disabled.');
+    }
+
     permission = await Geolocator.checkPermission();
 
     if (permission == LocationPermission.denied) {