Fix a race
Fix a race

go9p tries hard to reuse fcall structs. This reuse is not as valuable as it was
since the allocator is better.

Disable the reuse with a strategic use of false.

Consider removing the code, because it's not likely we needed these smarts and races are bad.

We now pass go test -race .

Signed-off-by: Ronald G. Minnich <f569d0af9a3481c4007b95c7180d6c41009f2513@gmail.com>

lionkov/ninep,edahlgren/go9p