Merge "Merge "Revert "towctrans() should return the input and set errno on failure."" into android15-tests-dev am: fd55858120" into main am: 4a07464a7a

Original change: https://android-review.googlesource.com/c/platform/bionic/+/3261398

Change-Id: I345a9d1cdd6e82b62ddcea1e31a0df70056876f7
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>