osutil: fix memory leak of PyBytes of path in statfiles Spotted with cpychecker.

revert: move prefetch to after the actions logic The prefetch logic came before the actual population of the actions collection, so it was always being passed an empty action list. This fixes it by moving it to after that logic. The only consumer of this function at the moment is remotefilelog, and I verified it works with this change.

diffhelpers: fix botched return statement from c8e7fa41bfc5 Spotted by Sean Farley using clang.