[Bug mi/17109] gdb 7.7 crashes when issuing mi command: -trace-frame-collected

["dtaylor at emc dot com" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=17109

--- Comment #3 from David Taylor <dtaylor at emc dot com> ---
In mi_cmd_trace_frame_collected we find the line:

  tinfo = get_traceframe_info ();

Now, get_traceframe_info can legitimately return NULL.

And, since this is a remote target to a stub that does not
support the qXfer:traceframe-info:read message, it DOES
return NULL.

Later in the function we find the line:

    for (i = 0; VEC_iterate (int, tinfo->tvars, i, tvar); i++)

There is no guard to check that tinfo is non NULL, so this produces the
core dump.

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