[App/IO] Don't shadow outer loop variable.

The outer loop is also over variable named 'k'.

Applications/FileIO/TetGenInterface.cpp

@@ -492,8 +492,9 @@ bool TetGenInterface::parseElements(std::ifstream& ins,
         }
         // insert new element into vector
         auto** tet_nodes = new MeshLib::Node*[4];
-        for (unsigned k(0); k<4; k++) {
-            tet_nodes[k] = nodes[ids[k]];
+        for (int n = 0; n < 4; n++)
+        {
+            tet_nodes[n] = nodes[ids[n]];
         }
         elements.push_back (new MeshLib::Tet(tet_nodes));
         materials.push_back(region);