open_posix: Re-init static variable to avoid errors during multiple runs

[extinguish]

open_posix: the static variables need to re-init before running again, thus to aovid report error with running multiple times

Signed-off-by: Huang Qi [email protected]

[metan-ucw]

So this is same as #1067 and you are doing something very strange that static variables needs to be reinitialized this way. I do not understand why this is needed at all.