On Thu, Jun 17, 2021 at 04:30:53PM +0800, Zhen Lei wrote:

Fixes scripts/checkpatch.pl warning:
WARNING: Possible unnecessary 'out of memory' message

Remove it can help us save a bit of memory.

Well, we have a few more messages in tests regarding failed memory
allocations.  Though I've never seen one in practice, I think it's not
a big deal to have that one here as well. The failures in the testsuite
are intentionally verbose and saving a few bytes in optional development
feature hardly bothers anyone.

Where bytes can be saved are error messages for the same type of error,
that I've implemented in the past, see file fs/btrfs/tests/btrfs-tests.c
array test_error that maps enums to strings.