"Fix openmp type mismatch"

src/gpu/GridGenerator/grid/GridStrategy/GridCpuStrategy/GridCpuStrategy.cpp

@@ -59,7 +59,7 @@ void GridCpuStrategy::allocateGridMemory(SPtr<GridImp> grid)
 void GridCpuStrategy::initalNodesToOutOfGrid(SPtr<GridImp> grid)
 {
 #pragma omp parallel for
-    for (uint index = 0; index < grid->size; index++)
+    for (int index = 0; index < (int)grid->size; index++)
         grid->initalNodeToOutOfGrid(index);
 }
 
@@ -72,14 +72,14 @@ void GridCpuStrategy::allocateFieldMemory(Field* field)
 void GridCpuStrategy::findInnerNodes(SPtr<GridImp> grid)
 {
 #pragma omp parallel for
-    for (uint index = 0; index < grid->size; index++)
+    for (int index = 0; index < (int)grid->size; index++)
         grid->findInnerNode(index);
 }
 
 void GridCpuStrategy::findEndOfGridStopperNodes(SPtr<GridImp> grid)
 {
 #pragma omp parallel for
-	for (uint index = 0; index < grid->size; index++)
+	for (int index = 0; index < (int)grid->size; index++)
 		grid->findEndOfGridStopperNode(index);
 }
 
@@ -102,7 +102,7 @@ void GridCpuStrategy::findSparseIndices(SPtr<GridImp> coarseGrid, SPtr<GridImp>
 void GridCpuStrategy::findForNeighborsNewIndices(SPtr<GridImp> grid)
 {
 #pragma omp parallel for
-    for (uint index = 0; index < grid->getSize(); index++)
+    for (int index = 0; index < (int)grid->getSize(); index++)
         grid->setNeighborIndices(index);
 }