ALSA: firewire: use 'GPL' string for module license contributed by Clemens Ladisch

In MODULE_LICENSE macro, "GPL" string obsoletes "GPL v2" string by a
commit bf7fbeea ("module: Cure the MODULE_LICENSE "GPL" vs. "GPL v2"
bogosity").

This commit uses the preferable expression.
Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>
Link: https://lore.kernel.org/r/20230611144445.221529-3-o-takashi@sakamocchi.jpSigned-off-by: Takashi Iwai <tiwai@suse.de>

sound/firewire/dice/dice.c

@@ -9,7 +9,7 @@
 
 MODULE_DESCRIPTION("DICE driver");
 MODULE_AUTHOR("Clemens Ladisch <clemens@ladisch.de>");
-MODULE_LICENSE("GPL v2");
+MODULE_LICENSE("GPL");
 
 #define OUI_WEISS		0x001c6a
 #define OUI_LOUD		0x000ff2

sound/firewire/isight.c

@@ -77,7 +77,7 @@ struct audio_payload {
 
 MODULE_DESCRIPTION("iSight audio driver");
 MODULE_AUTHOR("Clemens Ladisch <clemens@ladisch.de>");
-MODULE_LICENSE("GPL v2");
+MODULE_LICENSE("GPL");
 
 static struct fw_iso_packet audio_packet = {
 	.payload_length = sizeof(struct audio_payload),

sound/firewire/lib.c

@@ -69,4 +69,4 @@ EXPORT_SYMBOL(snd_fw_transaction);
 
 MODULE_DESCRIPTION("FireWire audio helper functions");
 MODULE_AUTHOR("Clemens Ladisch <clemens@ladisch.de>");
-MODULE_LICENSE("GPL v2");
+MODULE_LICENSE("GPL");

sound/firewire/oxfw/oxfw.c

@@ -32,7 +32,7 @@
 
 MODULE_DESCRIPTION("Oxford Semiconductor FW970/971 driver");
 MODULE_AUTHOR("Clemens Ladisch <clemens@ladisch.de>");
-MODULE_LICENSE("GPL v2");
+MODULE_LICENSE("GPL");
 MODULE_ALIAS("snd-firewire-speakers");
 MODULE_ALIAS("snd-scs1x");