remove compile-time warning that my checkin from this morning introduced

xpfe/appshell/src/nsCommonDialogs.cpp

@@ -252,7 +252,7 @@ nsresult nsCommonDialogs::Select(nsIDOMWindow *inParent, const PRUnichar *inDial
 	block->SetString( 0, inDialogTitle );
 	block->SetString(1, inMsg );
 	block->SetInt( eSelection, inCount );
-	for ( PRInt32 i = 2; i<= inCount+1; i++ )
+	for ( PRUint32 i = 2; i<= inCount+1; i++ )
 	{
 		nsAutoString temp(inList[i-2]  );
 		const PRUnichar* text = temp.GetUnicode();

xpfe/appshell/src/nsNetSupportDialog.cpp

@@ -560,7 +560,6 @@ nsresult nsNetSupportDialog::Select(const PRUnichar *inDialogTitle, const PRUnic
       appshellservice->GetHiddenWindow(getter_AddRefs( webshellwindow ) );
      nsCOMPtr<nsIPrompt> prompter(do_QueryInterface( webshellwindow ));
      PRInt32 selectedIndex;
-     PRBool rtnValue;
      rv = prompter->Select( inDialogTitle, inMsg, inCount, inList, outSelection,_retval );
      *outSelection = selectedIndex;
      return rv;