[Toybox] [PATCH] dirtree: Prevent calling closedir() on null pointer

[Kana Steimle]

While glibc gracefully ignores calling closedir() on a null pointer,
musl will instead segfault, which causes programs that rely on
dirtree_recurse or dirtree_flagread (cp, du, find, tar...) to segfault
if it encounters a directory it isn't able to open. This patch
prevents that from happening.
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