More Coverity warnings fixes.

common/widgets/mathplot.cpp

@@ -605,6 +605,9 @@ mpFXY::mpFXY( wxString name, int flags )
     m_type      = mpLAYER_PLOT;
     m_scaleX    = NULL;
     m_scaleY    = NULL;
+
+    // Avoid not initialized members:
+    maxDrawX = minDrawX = maxDrawY = minDrawY = 0;
 }
 
 

include/widgets/mathplot.h

@@ -770,7 +770,9 @@ public:
     struct TickLabel
     {
         TickLabel( double pos_ = 0.0, const wxString& label_ = wxT("") ) :
-            pos( pos_ ), label( label_ ) {};
+            pos( pos_ ), label( label_ ), pixelPos( 0 ), visible( true )
+        {}
+
         double pos;
         wxString label;
         int pixelPos;

pcbnew/class_board.cpp

@@ -238,7 +238,7 @@ static int find_vias_and_tracks_at( TRACKS& at_next, TRACKS& in_net, LSET& lset,
         {
             lset |= t->GetLayerSet();
             at_next.push_back( t );
-            in_net.erase( it );
+            it = in_net.erase( it );
         }
         else
             ++it;