bsc_msc_ip: Attempt to handle assignment failures more properly

1.) when we do get a assignment failure from the MS. It is coming
    on the old channel and not the new one. Fix the comparison. Also
    always reset the msc_data to NULL before dropping the reference
2.) the LCHAN signal handler in bssap.c claims that the T10 expire
    cb should free the secondary channel. It currently does not do
    it and we have to do it now...

the whole thing was not tested and even after this commit this
behavior is not heavily excercised... with OsmocoreBB we would be
able to do this in the future.

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