- If mkdir() fails on a component (no matter what the error is),
stat() the result. If the stat() fails, print the error mkdir() generated.
Otherwise, if the result is not a directory, explicitly fail with ENOTDIR.
- Move the chmod() of last element to be done only if the mkdir() succeeded
(i.e, it wasn't an existing directory)
Fixes problem introduced in previous commit where "mkdir -p existing"
on a read-only file system would incorrectly return a non zero exit code,
whilst retaining the race-condition fix of the previous commit.
Thanks to simonb@ for sanity checking my fix versus the standards.
ee7f3a601a