[reSIProcate] Parser hang

[palladin]

Dear resiprocate devels,
resiprocate 1.9.2

I have met the situation when some uacs send malformed Authorization 
header, for example
Authorization: Digest 
username="000999234",realm="1.1.1.1",nonce="1413544408:b15ee1a80dd75f9db443e2d4feab821b",uri="sip:1.1.1.1",=MD5,response="ef0f8cdc6a75fe810e2ce82a2758f45e".

You may notice that algorithm type is missing. In this case all 
application hangs inside infinite loop.
Could you please take a look on  the patch provided in attachment? Can 
it be applied to Auth?

Sincerely, Taras.
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