[Axl] [BUG] memory leaks

[Benoit Amiaux]

Hello,

I found some memory leaks in __axl_doc_parse_common

at axl_doc.c:1048 a new stream is allocated
then at axl_doc.c:1052 a new document is allocated

Soon after, there are several checks for errors, but when those fail, no 
clean up is done on those two pointers

(see axl_stream_detect_codification or axl_doc_parse_xml_header)

Those leaks were found because I don't manage to use latest axl trunk 
properly. During any connection, I get the following message:
"(proc 2932): (critical) vortex-connection: found an error while parsing 
greetings message: unable to detect encoding format, failed to detect 
encoding format"
I'm not sure yet how to fix it.

Thanks,
Benoît AMIAUX