[Live-devel] MediaSession fRTPSocket double free bug fix

[ChanMin Kim]

from 'liveMedia/MediaSession.cpp'

------------------------
} else {
 // We couldn't create the RTCP socket (perhaps that port number's
already in use elsewhere?)
 delete fRTCPSocket;

 // Record the first socket in our table, and keep trying:
 unsigned key = (unsigned)fClientPortNum;
------------------------

There must be  fRTCPSocket = NULL; after delete.

One scenario double free could happen is as follows:
1. 'delete fRTCPSocket;' from the above was called
2. getSourcePort() have failed
3. delete fRTCPSocket again outside the while loop.

The scenario actually happened to me.