Staging: comedi: pcl726: fixed a spelling mistake

Fixed a spelling mistake issue

Signed-off-by: Lokesh Chebrolu <lokeshch007@gmail.com>
Link: https://lore.kernel.org/r/1596784806-7130-1-git-send-email-lokeshch007@gmail.com


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>