ext2fs: always attempt to load nls table when loading the filesystem

ext2fs: always attempt to load nls table when loading the filesystem

fs->encoding is exposed by the library, so we need to at least try to
load it when populating ext2_filsys.  Nevertheless, failing to do so
shouldn't be a fatal error, unless the user really needs that
information.  Thus, we ignore this failure during open/initialization
and let the user who needs it validate that field before trying to use
it.

Signed-off-by: Gabriel Krisman Bertazi <krisman@collabora.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>