fix assert

git-svn-id: svn://svn.savannah.gnu.org/nano/trunk/nano@2223 35c25a1d-7b9e-4130-9fde-d3aeb78583b8

src/winio.c

@@ -2506,7 +2506,7 @@ void nanoget_repaint(const char *buf, const char *inputbuf, size_t x)
 		FALSE);
 
 	assert(wid > 0);
-	assert(strlen(expanded) <= wid);
+	assert(strlenpt(expanded) <= wid);
 
 	waddstr(bottomwin, expanded);
 	free(expanded);