ALSA: firewire: Simplify with str_on_off()

Use the standard helper str_on_off() to simplify the code.
Only code refactoring, no behavior change.

Reviewed-by: Takashi Sakamoto <[e-mail]>
Link: https://patch.msgid.link/[e-mail]
Signed-off-by: Takashi Iwai <[e-mail]>

sound/firewire/fireface/ff-protocol-former.c

···
 
 	snd_iprintf(buffer, "Output S/PDIF format: %s (Emphasis: %s)\n",
 		    (data & 0x00000020) ? "Professional" : "Consumer",
-		    (data & 0x00000040) ? "on" : "off");
+		    str_on_off(data & 0x00000040));
 
 	snd_iprintf(buffer, "Optical output interface format: %s\n",
 		    (data & 0x00000100) ? "S/PDIF" : "ADAT");
 
 	snd_iprintf(buffer, "Word output single speed: %s\n",
-		    (data & 0x00002000) ? "on" : "off");
+		    str_on_off(data & 0x00002000));
 
 	snd_iprintf(buffer, "S/PDIF input interface: %s\n",
 		    (data & 0x00000200) ? "Optical" : "Coaxial");