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log: Match implicit va_start() with va_end() in vlogmsg()
According to C99, 7.15.1:
Each invocation of the va_start and va_copy macros shall be matched
by a corresponding invocation of the va_end macro in the same
function
and the same applies to C11. I still have to come across a platform
where va_end() actually does something, but thus spake the standard.
This would be reported by Coverity as "Missing varargs init or
cleanup" (CWE-573).
Fixes: c0426ff10b
("log: Add vlogmsg()")
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
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