dg : remove segfaulting delete

Solver/dgConservationLaw.cpp

@@ -136,7 +136,7 @@ public:
       }
     }
   }
-  ~neumann_ () {if (diffusiveFlux)delete diffusiveFlux;}
+  ~neumann_ () {}
 };
 
 dataCacheDouble *dgBoundaryCondition::newDiffusiveDirichletBC(dataCacheMap &cacheMapLeft) const {

Solver/dgConservationLawPerfectGas.cpp

@@ -770,7 +770,7 @@ class dgBoundaryConditionPerfectGasLaw2dWall : public dgBoundaryCondition {
 	_value(i,3) = 0.0; 
       }
     }
-    ~neumannNonSlip () {if (diffusiveFlux)delete diffusiveFlux;}
+    ~neumannNonSlip (){}; 
   };
 
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