Fix some warnings.

git-svn-id: svn://svn.code.sf.net/p/irrlicht/code/trunk@5067 dfc29bdd-3216-0410-991c-e03cc46cb475

source/Irrlicht/CGUIFileOpenDialog.cpp

@@ -383,8 +383,9 @@ void CGUIFileOpenDialog::fillListBox()
 		{
 			#ifndef _IRR_WCHAR_FILESYSTEM
 			const c8 *cs = (const c8 *)FileList->getFileName(i).c_str();
-			wchar_t *ws = new wchar_t[strlen(cs) + 1];
-			int len = mbstowcs(ws,cs,strlen(cs));
+			size_t lencs = strlen(cs);
+			wchar_t *ws = new wchar_t[lencs + 1];
+			size_t len = mbstowcs(ws, cs, lencs);
 			ws[len] = 0;
 			s = ws;
 			delete [] ws;
@@ -399,8 +400,9 @@ void CGUIFileOpenDialog::fillListBox()
 	{
 		#ifndef _IRR_WCHAR_FILESYSTEM
 		const c8 *cs = (const c8 *)FileSystem->getWorkingDirectory().c_str();
-		wchar_t *ws = new wchar_t[strlen(cs) + 1];
-		int len = mbstowcs(ws,cs,strlen(cs));
+		size_t lencs = strlen(cs);
+		wchar_t *ws = new wchar_t[lencs + 1];
+		size_t len = mbstowcs(ws, cs, lencs);
 		ws[len] = 0;
 		s = ws;
 		delete [] ws;