Fix minor compil and Coverity warnings.

eeschema/ee_collectors.h

@@ -49,7 +49,8 @@ public:
 
     EE_COLLECTOR( const KICAD_T* aScanTypes = EE_COLLECTOR::AllItems ) :
         m_Unit( 0 ),
-        m_Convert( 0 )
+        m_Convert( 0 ),
+        m_ShowPinElectricalTypes( false )
     {
         SetScanTypes( aScanTypes );
     }

eeschema/tools/sch_edit_tool.cpp

@@ -1886,14 +1886,14 @@ int SCH_EDIT_TOOL::ChangeTextType( const TOOL_EVENT& aEvent )
             auto prepareForNetName =
                     []( wxString& aText )
                 {
-                    wxString txt = aText;
-                    txt.Replace( "\n", "_" );
-                    txt.Replace( "\r", "_" );
-                    txt.Replace( "\t", "_" );
-                    txt.Replace( " ", "_" );
+                    wxString local_txt = aText;
+                    local_txt.Replace( "\n", "_" );
+                    local_txt.Replace( "\r", "_" );
+                    local_txt.Replace( "\t", "_" );
+                    local_txt.Replace( " ", "_" );
 
                     // label strings are "escaped" i.e. a '/' is replaced by "{slash}"
-                    return EscapeString( txt, CTX_NETNAME );
+                    return EscapeString( local_txt, CTX_NETNAME );
                 };
 
             switch( convertTo )

pcbnew/pcb_bitmap.cpp

@@ -76,7 +76,7 @@ PCB_BITMAP& PCB_BITMAP::operator=( const BOARD_ITEM& aItem )
         delete m_image;
         m_image = new BITMAP_BASE( *bitmap->m_image );
         m_pos = bitmap->m_pos;
-        m_image->SetPixelSizeIu( Mils2iu( 1000 ) / m_image->GetPPI() );
+        m_image->SetPixelSizeIu( (float) Mils2iu( 1000 ) / m_image->GetPPI() );
     }
 
     return *this;