Fixed dead store analyzer warnings

These values weren’t being used for anything.

platform/ios/MGLMapboxEvents.m

@@ -699,7 +699,6 @@ NSString *const MGLEventGestureRotateStart = @"Rotation";
     if([challenge.protectionSpace.authenticationMethod isEqualToString:NSURLAuthenticationMethodServerTrust]) {
 
         SecTrustRef serverTrust = [[challenge protectionSpace] serverTrust];
-        NSString *domain = [[challenge protectionSpace] host];
         SecTrustResultType trustResult;
 
         // Validate the certificate chain with the device's trust store anyway

platform/ios/MGLMetricsLocationManager.m

@@ -89,34 +89,17 @@
 }
 
 - (void)locationManager:(CLLocationManager *)manager didChangeAuthorizationStatus:(CLAuthorizationStatus)status {
-    NSString *newStatus = nil;
     switch (status) {
-        case kCLAuthorizationStatusNotDetermined:
-            newStatus = @"User Hasn't Determined Yet";
-            break;
-        case kCLAuthorizationStatusRestricted:
-            newStatus = @"Restricted and Can't Be Changed By User";
-            break;
         case kCLAuthorizationStatusDenied:
-            newStatus = @"User Explcitly Denied";
             [self stopUpdatingLocation];
             [self stopMonitoringVisits];
             break;
         case kCLAuthorizationStatusAuthorized:
-            newStatus = @"User Has Authorized / Authorized Always";
-            [self startUpdatingLocation];
-            [self startMonitoringVisits];
-            break;
-//        case kCLAuthorizationStatusAuthorizedAlways:
-//            newStatus = @"Not Determined";
-//            break;
         case kCLAuthorizationStatusAuthorizedWhenInUse:
-            newStatus = @"User Has Authorized When In Use Only";
             [self startUpdatingLocation];
             [self startMonitoringVisits];
             break;
         default:
-            newStatus = @"Unknown";
             break;
     }
 }

src/clipper/clipper.cpp

@@ -4136,7 +4136,6 @@ void ClipperOffset::DoOffset(double delta)
       }
       else
       {
-        k = 1;
         m_sinA = 0;
         if (node.m_endtype == etOpenSquare)
           DoSquare(0, 1);

src/libtess2/mesh.c

@@ -794,7 +794,6 @@ void tessMeshCheckMesh( TESSmesh *mesh )
 	TESSvertex *v, *vPrev;
 	TESShalfEdge *e, *ePrev;
 
-	fPrev = fHead;
 	for( fPrev = fHead ; (f = fPrev->next) != fHead; fPrev = f) {
 		assert( f->prev == fPrev );
 		e = f->anEdge;
@@ -809,7 +808,6 @@ void tessMeshCheckMesh( TESSmesh *mesh )
 	}
 	assert( f->prev == fPrev && f->anEdge == NULL );
 
-	vPrev = vHead;
 	for( vPrev = vHead ; (v = vPrev->next) != vHead; vPrev = v) {
 		assert( v->prev == vPrev );
 		e = v->anEdge;
@@ -824,7 +822,6 @@ void tessMeshCheckMesh( TESSmesh *mesh )
 	}
 	assert( v->prev == vPrev && v->anEdge == NULL );
 
-	ePrev = eHead;
 	for( ePrev = eHead ; (e = ePrev->next) != eHead; ePrev = e) {
 		assert( e->Sym->next == ePrev->Sym );
 		assert( e->Sym != e );