[PATCH v4 4/7] staging: speakup: replace spk_strlwr() with strlcpytolower()

[Chris Brannon]

After introducing generic strltolower() and strtolower(), spk_strlwr()
is no longer needed.

Acked-by: Chris Brannon <***@the-brannons.com>

Haven't looked at much kernel code in a while, but this looks good.

-- Chris