Virtual Midi
Can't have a boolean and a sign bit in 1 bit.

Fix (14) boolean/bitfield sparse warning:
include/sound/seq_virmidi.h:41:16: warning: dubious one-bit signed bitfield
Signed-off-by: Randy Dunlap <rddunlap@osdl.org>
Signed-off-by: Takashi Iwai <tiwai@suse.de>