MAINTAINERS: Fix errors reported by get_maintainer.py

There are two issues in MAINTAINERS.yml.

tests/subsys/fs/littlefs/ specified under Little FS doesn't have the
trailing slash (/).

The commit 0eaa495ccbe1a7c4680fd637c38042fa0c6df7a9 renamed
samples/drivers/CAN to can but MAINTAINERS.yml wasn't.

Signed-off-by: Yasushi SHOJI <yasushi.shoji@gmail.com>
1 file changed