UAPI headers are built with -std=c90 and C++ style comments are explicitly prohibited. The recent commit overlooked the rule and caused the error at header installation. This patch corrects those. Fixes:bea36afa10("ALSA: firewire-motu: add message parser to gather meter information in register DSP model") Fixes:90b28f3bb8("ALSA: firewire-motu: add message parser for meter information in command DSP model") Fixes:634ec0b290("ALSA: firewire-motu: notify event for parameter change in register DSP model") Reported-by: Stephen Rothwell <sfr@canb.auug.org.au> Acked-by: Takashi Sakamoto <o-takashi@sakamocchi.jp> Link: https://lore.kernel.org/r/20211018113812.0a16efb0@canb.auug.org.au Link: https://lore.kernel.org/r/20211018063700.30834-1-tiwai@suse.de Signed-off-by: Takashi Iwai <tiwai@suse.de>