block: add bdrv_co_delete_file_noerr

block: add bdrv_co_delete_file_noerr

This function wraps bdrv_co_delete_file for the common case of removing a file,
which was just created by format driver, on an error condition.

It hides the -ENOTSUPP error, and reports all other errors otherwise.

Use it in luks driver

Signed-off-by: Maxim Levitsky <[email protected]>
Reviewed-by: Alberto Garcia <[email protected]>
Message-Id: <20201217170904[email protected]>
Reviewed-by: Vladimir Sementsov-Ogievskiy <[email protected]>
Signed-off-by: Kevin Wolf <[email protected]>