[Path] remove superfluous nullptr checks

src/Mod/Path/App/Voronoi.cpp

@@ -192,7 +192,7 @@ void Voronoi::colorExterior(const Voronoi::diagram_type::edge_type *edge, std::s
   edge->color(colorValue);
   edge->twin()->color(colorValue);
   auto v = edge->vertex1();
-  if (v == nullptr || !edge->is_primary()) {
+  if (!v || !edge->is_primary()) {
     return;
   }
   v->color(colorValue);

src/Mod/Path/App/VoronoiCell.cpp

@@ -55,7 +55,7 @@ VoronoiCell::~VoronoiCell() {
 }
 
 bool VoronoiCell::isBound(void) const {
-  if (ptr != nullptr && dia.isValid() && index != Voronoi::InvalidIndex) {
+  if (ptr && dia.isValid() && index != Voronoi::InvalidIndex) {
     if (&(dia->cells()[index]) == ptr) {
       return true;
     }

src/Mod/Path/App/VoronoiEdge.cpp

@@ -56,7 +56,7 @@ VoronoiEdge::~VoronoiEdge() {
 }
 
 bool VoronoiEdge::isBound(void) const {
-  if (ptr != nullptr && dia.isValid() && index != Voronoi::InvalidIndex) {
+  if (ptr && dia.isValid() && index != Voronoi::InvalidIndex) {
     if (&(dia->edges()[index]) == ptr) {
       return true;
     }

src/Mod/Path/App/VoronoiPyImp.cpp

@@ -188,7 +188,7 @@ static bool callbackWithVertex(Voronoi::diagram_type *dia, PyObject *callback, c
 #endif
       Py_DECREF(arglist);
       Py_DECREF(vx);
-      if (result == nullptr) {
+      if (!result) {
         bail = true;
       } else {
         rc = result == Py_True;

src/Mod/Path/App/VoronoiVertex.cpp

@@ -56,7 +56,7 @@ VoronoiVertex::~VoronoiVertex() {
 }
 
 bool VoronoiVertex::isBound(void) const {
-  if (ptr != nullptr && dia.isValid() && index != Voronoi::InvalidIndex) {
+  if (ptr && dia.isValid() && index != Voronoi::InvalidIndex) {
     if (&(dia->vertices()[index]) == ptr) {
       return true;
     }