fs: remove needless assignment of null
Checklist
-
make -j4 test
(UNIX), orvcbuild test nosign
(Windows) passes -
tests and/or benchmarks are included -
commit message follows commit guidelines
Affected core subsystem(s)
streams
Description of change
This line pool = null;
isn't needed and has been around since the first iteration of fs.stream
. I can't find a good reason for it to exist, it's not more readable, nor does it seem to trick the compiler into any optimizations.