Previous commit broke dd(1)'s I/O summary when it's terminated by a signal.  Fix it by adding an explicit call to summary() in terminate() (it was previously called implicitly by exit() because summary() was registered with atexit()).  summary() is supposed to be signal-safe-- it handles SIGINFO almost exclusively--so this should be safe.
Previous commit broke dd(1)'s I/O summary when it's terminated by a
signal.  Fix it by adding an explicit call to summary() in terminate()
(it was previously called implicitly by exit() because summary() was
registered with atexit()).  summary() is supposed to be signal-safe--
it handles SIGINFO almost exclusively--so this should be safe.

Submitted by:	bde

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