deleted unused variable in FileWriter.cpp

src/gpu/VirtualFluids_GPU/Output/FileWriter.cpp

@@ -195,7 +195,6 @@ void FileWriter::writeUnstrucuredGridAD(SPtr<Parameter> para, std::vector<std::s
     unsigned int number1, number2, number3, number4, number5, number6, number7, number8;
     unsigned int dn1, dn2, dn3, dn4, dn5, dn6, dn7, dn8;
     bool neighborsAreFluid;
-    double vxmax             = 0;
     unsigned int startpos    = 0;
     unsigned int endpos      = 0;
     unsigned int sizeOfNodes = 0;