ALSA: seq: seq_oss_event: fix inconsistent indenting warning in note_on_event()

Fix below inconsistent indenting smatch warning.
smatch warnings:
sound/core/seq/oss/seq_oss_event.c:297 note_on_event() warn: inconsistent indenting

Signed-off-by: Charles Han <hanchunchao@inspur.com>
Link: https://patch.msgid.link/20250228033427.7056-1-hanchunchao@inspur.com


Signed-off-by: Takashi Iwai <tiwai@suse.de>