common.c: fixed SIGSEGV on nondefault log tagret (double va_list usage)
SIGSEGV is caused on my system (amd64 gentoo glibc-2.10.1)
by multiple usages of va_list variable without reinitialization.
Reinitialize before each use.
This patch is based on the patch of Sergei Trofimovich <email@example.com>.
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