Fix compiler warnings introduced in 3430.

eeschema/component_references_lister.cpp

@@ -42,7 +42,7 @@
 //#define USE_OLD_ALGO
 
 
-void SCH_REFERENCE_LIST::RemoveItem( int aIndex )
+void SCH_REFERENCE_LIST::RemoveItem( unsigned int aIndex )
 {
     if( aIndex < componentFlatList.size() )
         componentFlatList.erase( componentFlatList.begin() + aIndex );

eeschema/dialogs/dialog_build_BOM.cpp

@@ -855,7 +855,7 @@ int DIALOG_BUILD_BOM::PrintComponentsListByRef( FILE*               f,
 int DIALOG_BUILD_BOM::PrintComponentsListByPart( FILE* aFile, SCH_REFERENCE_LIST& aList,
                                                  bool aIncludeSubComponents )
 {
-    int index = 0;
+    unsigned int index = 0;
     while( index < aList.GetCount() )
     {
         SCH_COMPONENT *component = aList[index].GetComponent();

eeschema/netlist.h

@@ -220,7 +220,13 @@ public:
         componentFlatList.push_back( aItem );
     }
 
-    void RemoveItem( int aIndex );
+    /**
+     * Function RemoveItem
+     * removes an item from the list of references.
+     *
+     * @param aIndex is the index of the item to be removed.
+     */
+    void RemoveItem( unsigned int aIndex );
 
     /**
      * Function RemoveSubComponentsFromList