Tidy up some Coverity issues.

common/project.cpp

@@ -465,27 +465,23 @@ FP_LIB_TABLE* PROJECT::PcbFootprintLibs( KIWAY& aKiway )
 
     FP_LIB_TABLE* tbl = (FP_LIB_TABLE*) GetElem( ELEM_FPTBL );
 
-    // its gotta be NULL or a FP_LIB_TABLE, or a bug.
-    wxASSERT( !tbl || tbl->Type() == FP_LIB_TABLE_T );
-
-    if( !tbl )
+    if( tbl )
+    {
+        wxASSERT( tbl->Type() == FP_LIB_TABLE_T );
+    }
+    else
+    {
+        try
         {
             // Build a new project specific FP_LIB_TABLE with the global table as a fallback.
             // ~FP_LIB_TABLE() will not touch the fallback table, so multiple projects may
             // stack this way, all using the same global fallback table.
             KIFACE* kiface = aKiway.KiFACE( KIWAY::FACE_PCB );
 
-        if( kiface )
             tbl = (FP_LIB_TABLE*) kiface->IfaceOrAddress( KIFACE_NEW_FOOTPRINT_TABLE );
+            tbl->Load( FootprintLibTblName() );
 
-        wxASSERT( tbl );
             SetElem( ELEM_FPTBL, tbl );
-
-        wxString projectFpLibTableFileName = FootprintLibTblName();
-
-        try
-        {
-            tbl->Load( projectFpLibTableFileName );
         }
         catch( const IO_ERROR& ioe )
         {

common/widgets/mathplot.cpp

@@ -1580,23 +1580,7 @@ void mpScaleY::Plot( wxDC& dc, mpWindow& w )
                     m_pen.SetStyle( wxPENSTYLE_DOT );
                     dc.SetPen( m_pen );
 
-                    if( (m_flags == mpALIGN_LEFT) && !m_drawOutsideMargins )
-                    {
-                        dc.DrawLine( orgx - 4, p, endPx, p );
-                    }
-                    else
-                    {
-                        if( (m_flags == mpALIGN_RIGHT) && !m_drawOutsideMargins )
-                        {
-                            // dc.DrawLine( orgX-4, p, orgx+4, p);
                     dc.DrawLine( orgx - 4, p, endPx, p );
-                        }
-                        else
-                        {
-                            dc.DrawLine( orgx - 4, p, endPx, p );
-                            // dc.DrawLine( orgx-4/*-w.GetScrX()*/, p, w.GetScrX(), p);
-                        }
-                    }
 
                     m_pen.SetStyle( wxPENSTYLE_SOLID );
                     dc.SetPen( m_pen );

eeschema/tools/sch_line_wire_bus_tool.cpp

@@ -584,7 +584,7 @@ int SCH_LINE_WIRE_BUS_TOOL::doDrawSegments( const std::string& aTool, int aType
                 segment = startSegments( aType, VECTOR2D( cursorPos ) );
             }
             // Create a new segment if we're out of previously-created ones
-            else if( !segment->IsNull() || ( forceHV && !m_wires.end()[-2]->IsNull() ) )
+            else if( !segment->IsNull() || ( forceHV && !m_wires[ m_wires.size() - 2 ]->IsNull() ) )
             {
                 // Terminate the command if the end point is on a pin, junction, or another
                 // wire or bus.
@@ -611,7 +611,7 @@ int SCH_LINE_WIRE_BUS_TOOL::doDrawSegments( const std::string& aTool, int aType
             if( evt->IsDblClick( BUT_LEFT ) && segment )
             {
                 if( forceHV && m_wires.size() >= 2 )
-                    computeBreakPoint( { m_wires.end()[-2], segment }, cursorPos );
+                    computeBreakPoint( { m_wires[ m_wires.size() - 2 ], segment }, cursorPos );
 
                 finishSegments();
                 segment = nullptr;
@@ -665,7 +665,7 @@ int SCH_LINE_WIRE_BUS_TOOL::doDrawSegments( const std::string& aTool, int aType
             {
                 // Coerce the line to vertical or horizontal if necessary
                 if( forceHV && m_wires.size() >= 2 )
-                    computeBreakPoint( { m_wires.end()[-2], segment }, cursorPos );
+                    computeBreakPoint( { m_wires[ m_wires.size() - 2 ], segment }, cursorPos );
                 else
                     segment->SetEndPoint( cursorPos );
             }