Coding - Remove redundant null checks before deallocation (#1077)

In C++, delete/delete[] on nullptr and free(NULL) are guaranteed no-ops.
This removes redundant null-check guards before these calls across 39
files, reducing code noise without behavioral change. Also simplifies
map value cleanup in BRepClass3d_SolidExplorer by using iterator
reference instead of redundant hash lookups.

src/ModelingAlgorithms/TKGeomAlgo/GeomFill/GeomFill_ConstrainedFilling.cxx

@@ -1248,10 +1248,7 @@ void GeomFill_ConstrainedFilling::PerformS1()
   // Un petit menage
   for (i = 0; i <= 3; i++)
   {
-    if (nt[i])
-    {
-      delete[] nt[i];
-    }
+    delete[] nt[i];
   }
 }
 

src/ModelingAlgorithms/TKGeomAlgo/IntPatch/IntPatch_Polyhedron.cxx

@@ -57,14 +57,11 @@ static int NbPOnV(const occ::handle<Adaptor3d_Surface>& S)
 void IntPatch_Polyhedron::Destroy()
 {
   gp_Pnt* CMyPnts = (gp_Pnt*)C_MyPnts;
-  if (C_MyPnts)
-    delete[] CMyPnts;
+  delete[] CMyPnts;
   double* CMyU = (double*)C_MyU;
-  if (C_MyU)
-    delete[] CMyU;
+  delete[] CMyU;
   double* CMyV = (double*)C_MyV;
-  if (C_MyV)
-    delete[] CMyV;
+  delete[] CMyV;
   C_MyPnts = C_MyU = C_MyV = nullptr;
 }
 

src/ModelingAlgorithms/TKGeomAlgo/IntPatch/IntPatch_PrmPrmIntersection.cxx

@@ -2392,11 +2392,8 @@ void IntPatch_PrmPrmIntersection::Perform(const occ::handle<Adaptor3d_Surface>&
     done = Interference.IsDone();
     if (!done)
     {
-      if (pInterference)
-      {
-        delete pInterference;
-        pInterference = nullptr;
-      }
+      delete pInterference;
+      pInterference = nullptr;
 
       return;
     }

src/ModelingAlgorithms/TKGeomAlgo/IntPatch/IntPatch_PrmPrmIntersection_T3Bits.cxx

@@ -30,11 +30,8 @@ IntPatch_PrmPrmIntersection_T3Bits::IntPatch_PrmPrmIntersection_T3Bits(const int
 
 IntPatch_PrmPrmIntersection_T3Bits::~IntPatch_PrmPrmIntersection_T3Bits()
 {
-  if (p)
-  {
-    delete[] p;
-    p = nullptr;
-  }
+  delete[] p;
+  p = nullptr;
 }
 
 void IntPatch_PrmPrmIntersection_T3Bits::ResetAnd()

src/ModelingAlgorithms/TKGeomAlgo/IntPolyh/IntPolyh_Intersection.cxx

@@ -180,8 +180,7 @@ void IntPolyh_Intersection::Perform(const NCollection_Array1<double>& theUPars1,
   {
     // Intersection not done
     myIsDone = false;
-    if (pMaillageStd)
-      delete pMaillageStd;
+    delete pMaillageStd;
     return;
   }
 
@@ -228,19 +227,14 @@ void IntPolyh_Intersection::Perform(const NCollection_Array1<double>& theUPars1,
     }
 
     // Clean up
-    if (pMaillageFF)
-      delete pMaillageFF;
-    if (pMaillageFR)
-      delete pMaillageFR;
-    if (pMaillageRF)
-      delete pMaillageRF;
-    if (pMaillageRR)
-      delete pMaillageRR;
+    delete pMaillageFF;
+    delete pMaillageFR;
+    delete pMaillageRF;
+    delete pMaillageRR;
   }
 
   // clean up
-  if (pMaillageStd)
-    delete pMaillageStd;
+  delete pMaillageStd;
 }
 
 //=================================================================================================