missing va_end calls

[Eric Blake]

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As promised:

2009-10-13  Eric Blake  <ebb9@byu.net>

	* external.cc (cygwin_internal): Use va_end.
	* fork.cc (child_copy): Likewise.
	* libc/bsdlib.cc (warn, warnx, err, errx): Likewise.
	* pinfo.cc (commune_request): Likewise.
	* strace.cc (strace::prntf, strace_printf): Likewise.

- --
Don't work too hard, make some time for fun as well!

Eric Blake             ebb9@byu.net
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