revlog: remove micro-optimization for looking up only nullid...
revlog: remove micro-optimization for looking up only nullid
index_find_node() would call nt_find() before initializing the node
tree. nt_find() would then return -2 unless the requested revision was
the null revision. I can't imagine what scenario that is optimizing
for, and doing the initialization earlier makes the code simpler and
easier to follow, so that's what this patch does.
Differential Revision:
https://phab.mercurial-scm.org/D4027
