e2fsprogs: Remove impossible name_len tests.

e2fsprogs: Remove impossible name_len tests.

The name_len field in ext2_dir_entry is actually comprised of
the name length in the lower 8 bytes, and the filetype in the
high 8 bytes.  So in places, we mask name_len with 0xFF to
get the actual length.

But once we have masked name_len with 0xFF, there is no point
in testing whether it is greater than EXT2_NAME_LEN, which
is 255 - or 0xFF.  So all of these tests are extraneous.

Signed-off-by: Eric Sandeen <sandeen@redhat.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>