tree 3158965a923bc82494016c96961ca1211b9cec59
parent 303b43ca5a93ce89f438ad4dd200c0ca317832de
author Dan Albert <danalbert@google.com> 1460752961 -0700
committer Christopher Wiley <wiley@google.com> 1464888150 -0700

Include the failed directory name if _mkdir fails.

( cherry-picked from 767d301911e31216e0f7c2659e79cf8f3763575e )

http://b.android.com/202972 shows a failure here, but we lack the
information to know what the bad input was. My guess is that it's
caused by POSIX path separators, but we should add more details to
the error message for the future.

Bug: http://b.android.com/202972
Bug: 29091703
Change-Id: I6fa131604e0268c6ddbea5c9d1499897754f197d