Fix clang warnings in plCubicRenderTargetModifier.

Sources/Plasma/PubUtilLib/plPipeline/plCubicRenderTargetModifier.cpp

@@ -169,11 +169,6 @@ bool    plCubicRenderTargetModifier::IEval( double secs, float del, uint32_t dir
 
 bool    plCubicRenderTargetModifier::MsgReceive( plMessage* msg )
 {
-    plSceneObject       *scene;
-    plCubicRenderTarget *cubic;
-    int                 i;
-
-
     plEvalMsg* eval = plEvalMsg::ConvertNoRef(msg);
     if (eval)
     {
@@ -182,34 +177,39 @@ bool    plCubicRenderTargetModifier::MsgReceive( plMessage* msg )
         IEval(secs, del, 0);
         return true;
     }
+
     plRefMsg* refMsg = plRefMsg::ConvertNoRef(msg);
     if (refMsg)
     {
-        if( scene = plSceneObject::ConvertNoRef( refMsg->GetRef() ) )
+        plSceneObject* scene = plSceneObject::ConvertNoRef(refMsg->GetRef());
+        if (scene)
         {
             if (refMsg->GetContext() & (plRefMsg::kOnCreate | plRefMsg::kOnRequest | plRefMsg::kOnReplace))
                 AddTarget(scene);
             else
                 RemoveTarget(scene);
         }
-        if( cubic = plCubicRenderTarget::ConvertNoRef( refMsg->GetRef() ) )
+
+        plCubicRenderTarget* cubic = plCubicRenderTarget::ConvertNoRef(refMsg->GetRef());
+        if (cubic)
         {
             if (refMsg->GetContext() & (plRefMsg::kOnCreate | plRefMsg::kOnRequest | plRefMsg::kOnReplace))
             {
                 fCubic = cubic;
-                for( i = 0; i < 6; i++ )
+                for (int i = 0; i < 6; i++)
                     ICreateRenderRequest(i);
             }
             else
             {
-                fCubic = nil;
-                for( i = 0; i < 6; i++ )
+                fCubic = nullptr;
+                for (int i = 0; i < 6; i++)
                 {
                     delete fRequests[i];
                     fRequests[i] = nil;
                 }
             }
         }
+
         return true;
     }