[automerger skipped] storageproxy: Report fsync failures with a distinct error...

[automerger skipped] storageproxy: Report fsync failures with a distinct error code am: cf458bae am: 6e48a1e5 -s ours

am skip reason: Merged-In Ie9d4a1949586e90006256c975786e21ced655e66 with SHA-1 1c75d1e3 is already in history

Original change: https://googleplex-android-review.googlesource.com/c/platform/system/core/+/19517837



Change-Id: I7f8e7192a580b8a2e842f34a05bd4b7ba0284895
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>