Merge branch 'as/tree-walk-fix-aggressive-short-cut' into maint

The pathspec matching code, while comparing two trees (e.g. "git
diff A B -- path1 path2") was too aggressive and failed to match
some paths when multiple pathspecs were involved.

* as/tree-walk-fix-aggressive-short-cut:
  tree_entry_interesting: match against all pathspecs

diff --cc tree-walk.c
Simple merge