[Toybox] [PATCH] find: fix dangling symlink behavior.

[enh]

ENOENT is ignored, but other errors are reported.
---
 lib/dirtree.c     | 2 +-
 tests/find.test   | 4 ++++
 toys/posix/find.c | 6 ++++--
 3 files changed, 9 insertions(+), 3 deletions(-)
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