msvcrt: Don't continue on demangle failure (Coverity).

Signed-off-by: André Hentschel <nerv@dawncrow.de>
Signed-off-by: Piotr Caban <piotr@codeweavers.com>
Signed-off-by: Alexandre Julliard <julliard@winehq.org>

dlls/msvcrt/undname.c

@@ -1379,6 +1379,8 @@ static BOOL symbol_demangle(struct parsed_symbol* sym)
                         sym->current++;
                         str_array_init(&pmt);
                         demangle_datatype(sym, &ct, &pmt, FALSE);
+                        if (!demangle_datatype(sym, &ct, NULL, FALSE))
+                            goto done;
                         function_name = str_printf(sym, "%s%s `RTTI Type Descriptor'",
                                                    ct.left, ct.right);
                         sym->current--;