Fix compil warnings

pcbnew/dialogs/dialog_pad_properties.cpp

@@ -944,7 +944,7 @@ void DIALOG_PAD_PROPERTIES::PadTypeSelected( wxCommandEvent& event )
 {
     int ii = m_PadType->GetSelection();
 
-    if( ii >= DIM( code_type ) ) // catches < 0 also
+    if( (unsigned)ii >= DIM( code_type ) ) // catches < 0 also
         ii = 0;
 
     bool hasHole, hasConnection;
@@ -994,7 +994,7 @@ void DIALOG_PAD_PROPERTIES::OnUpdateUI( wxUpdateUIEvent& event )
 {
     int ii = m_PadType->GetSelection();
 
-    if( ii >= DIM( code_type ) ) // catches < 0 also
+    if( (unsigned)ii >= DIM( code_type ) ) // catches < 0 also
         ii = 0;
 
     bool hasHole, hasConnection;

pcbnew/dialogs/dialog_plot.cpp

@@ -494,6 +494,9 @@ void DIALOG_PLOT::SetPlotFormat( wxCommandEvent& event )
 
         OnChangeDXFPlotMode( event );
         break;
+
+    case PLOT_FORMAT_UNDEFINED:
+        break;
     }
 
     /* Update the interlock between scale and frame reference

pcbnew/footprint_libraries_utils.cpp

@@ -713,6 +713,8 @@ bool FOOTPRINT_EDIT_FRAME::SaveFootprint( MODULE* aModule )
         DisplayError( this, ioe.What() );
         return false;
     }
+
+    return true;
 }