staging: comedi: ni_mio_common: Fix newline after dereference operator

Fix newline after dereference operator detected by checkpatch.

Signed-off-by: Vasily Utkin <vautkin@teknik.io>
Link: https://lore.kernel.org/r/20201010170721.98595-1-vautkin@teknik.io


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