ALSA: sound/usb/caiaq/midi.h: Checkpatch cleanup

sound/usb/caiaq/midi.h:6: ERROR: "foo* bar" should be "foo *bar"

Signed-off-by: Andrea Gelmini <andrea.gelmini@gelma.net>
Acked-by: Daniel Mack <daniel@caiaq.de>
Signed-off-by: Takashi Iwai <tiwai@suse.de>