[reSIProcate] [patch] possible memory corruption in SDP codec handling

[Robert Szokovacs]

Hi,

In a usual valgrind run, we noticed that is we call 
SdpContents::Session::Medium::codecs() then copy the Medium object, we get 
memory reads from places we should not access. The bug was tracked down to be 
a misunderstaning between Codec::parse() and the Medium's AttributeHelper, the 
AttributeHelper free's up the memory that was used by parse(). Patch and 
testcase to reproduce attached.

br

Szo
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