Fix minor compil warnings

eeschema/dialogs/dialog_spice_model.cpp

@@ -546,7 +546,7 @@ bool DIALOG_SPICE_MODEL::generatePowerSource( wxString& aTarget ) const
             // all empty
             useTrans = false;
         }
-        else if( std::distance( genericControls.begin(), first_empty ) < genericReqParamsCount )
+        else if( std::distance( genericControls.begin(), first_empty ) < (int)genericReqParamsCount )
         {
             DisplayError( nullptr,
                     wxString::Format( wxT( "You need to specify at least the "

eeschema/erc.cpp

@@ -246,7 +246,7 @@ int TestMultiunitFootprints( SCH_SHEET_LIST& aSheetList )
         wxString fp;
         wxString unitName;
 
-        for( int i = 0; i < component.second.GetCount(); ++i )
+        for( unsigned i = 0; i < component.second.GetCount(); ++i )
         {
             SCH_COMPONENT* cmp = refList.GetItem( i ).GetComp();
             SCH_SHEET_PATH sheetPath = refList.GetItem( i ).GetSheetPath();
@@ -260,7 +260,7 @@ int TestMultiunitFootprints( SCH_SHEET_LIST& aSheetList )
             }
         }
 
-        for( int i = 0; i < component.second.GetCount(); ++i )
+        for( unsigned i = 0; i < component.second.GetCount(); ++i )
         {
             SCH_REFERENCE& ref = refList.GetItem( i );
             SCH_COMPONENT* unit = ref.GetComp();