ALSA: usb-audio: fix typo

fix typo in midi fallback log.

Signed-off-by: Jacob Siverskog <jacob@teenage.engineering>
Fixes: ff49d1df ("ALSA: usb-audio: USB MIDI 2.0 UMP support")
Link: https://lore.kernel.org/r/20240124101827.35433-1-jacob@teenage.engineering


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