Fixed crash when in-dialog request fails to be sent within a subscription

Ignore-this: aa525f08fbcfc0f3cab11e35341ba229

The underlying function, pjsip_dlg_send_request takes care of decref-ing
the transport data, doing it twice causes a crash.

darcs-hash:20130918160616-56b4d-6ff8d29d29f65cb7eee98b368b7f5c4a878106cb
Raised core revision

Ignore-this: ebef9e90872df9072eaeb4be89125cf0

darcs-hash:20130918160958-56b4d-7c0e31e3af3ab1e9313841d6dbb690de404608b3
Added trace_msrp setting

Ignore-this: aee4a7bf3bc1ef5822c7609a41ae4897

darcs-hash:20130919085806-56b4d-153121c675ce072979fafa3b558365d43cb1297c