gsmtap_sendmsg(): clarify API doc concerning msgb ownership

Not freeing on error does enable callers to try to re-send as well, so it is a
kind of useful feature, even though I find it likely for callers to either
forget about freeing the msg on error or double-free by accident...

I considered changing gsmtap_sendmsg() to always free, but since it is public
API, I chose to keep and document its current behavior properly instead. We
don't know what callers may exist out there.

Change-Id: Id3266ce36442024f16eaf6afa3f516d201930c41

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