remove invalid null pointer checks

core/area.h

@@ -656,9 +656,6 @@ void RegularArea<NormalizedShape, Shape>::simplify()
 template <class NormalizedShape, class Shape>
 bool RegularArea<NormalizedShape, Shape>::isNull() const
 {
-    if ( !this )
-        return false;
-
     if ( this->isEmpty() )
         return false;
 
@@ -673,9 +670,6 @@ bool RegularArea<NormalizedShape, Shape>::isNull() const
 template <class NormalizedShape, class Shape>
 bool RegularArea<NormalizedShape, Shape>::intersects( const NormalizedShape& rect ) const
 {
-    if ( !this )
-        return false;
-
     if ( this->isEmpty() )
         return false;
 
@@ -725,9 +719,6 @@ void RegularArea<NormalizedShape, Shape>::appendArea( const RegularArea<Normaliz
 template <class NormalizedShape, class Shape>
 void RegularArea<NormalizedShape, Shape>::appendShape( const NormalizedShape& shape, MergeSide side )
 {
-    if ( !this )
-        return;
-
     int size = this->count();
     // if the list is empty, adds the shape normally
     if ( size == 0 )
@@ -800,9 +791,6 @@ void RegularArea<NormalizedShape, Shape>::appendShape( const NormalizedShape& sh
 template <class NormalizedShape, class Shape>
 bool RegularArea<NormalizedShape, Shape>::contains( double x, double y ) const
 {
-    if ( !this )
-        return false;
-
     if ( this->isEmpty() )
         return false;
 
@@ -829,7 +817,7 @@ bool RegularArea<NormalizedShape, Shape>::contains( const NormalizedShape& shape
 template <class NormalizedShape, class Shape>
 QList<Shape> RegularArea<NormalizedShape, Shape>::geometry( int xScale, int yScale, int dx, int dy ) const
 {
-    if ( !this || this->isEmpty() )
+    if ( this->isEmpty() )
         return QList<Shape>();
 
     QList<Shape> ret;
@@ -848,9 +836,6 @@ QList<Shape> RegularArea<NormalizedShape, Shape>::geometry( int xScale, int ySca
 template <class NormalizedShape, class Shape>
 void RegularArea<NormalizedShape, Shape>::transform( const QTransform &matrix )
 {
-    if ( !this )
-        return;
-
     if ( this->isEmpty() )
         return;