bug#17406: C-g C-g in GC causes crash

[Richard Stallman]

[[[ To any NSA and FBI agents reading my email: please consider    ]]]
[[[ whether defending the US Constitution against all enemies,     ]]]
[[[ foreign or domestic, requires you to follow Snowden's example. ]]]

When GC starts taking a long time, I can easily type C-g C-g during a
GC if I have garbage-collection-messages set.  This stops Emacs as it
should.  When I continue it, it asks (correctly) if I want to abort
and dump core.  I say no, and then it crashes.

A backtrace showed me why: tty_send_additional_strings calls
Fterminal_parameter which calls Fassq which does QUIT;

-- 
Dr Richard Stallman
President, Free Software Foundation
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