[PATCH] digest-md5 SASL challenges ending with a quoted value are parsed incorrectly

[Yann Kerherve]

> Thanks, Yann. I committed both your patches to im.pidgin.pidgin in
> 8b089c2f6fe2d4dd78d481892094de09dc76c1ec and have also propagated them to
> im.pidgin.adium.

Thanks for applying them so fast!

Yann