[BUG] CWE: 664

[Ionescu-Ioan]

Description of the bug:

After I used Cppcheck to perform static analysis of the source code of Redis I discoverd the following error:
CWE 664 : "va_list ‘_cpy’ used before va_start() was called" in deps/hiredis/hiredis.c

I'm not sure yet if it's a false positive or not, but if it's really a bug, it might affect the good functionality of the project.

[debing.sun]

i think it is a false positive.
the code copies ap to _cpy via va_copy(), so it doesnt need a va_start().