[ALSA] riptide: fix compile errors with older gcc

Change the syntax of a union initialization that is not understood by
gcc 2.x.
Signed-off-by: Clemens Ladisch <clemens@ladisch.de>
Signed-off-by: Jaroslav Kysela <perex@suse.cz>

sound/pci/riptide/riptide.c

@@ -673,8 +673,12 @@ static struct lbuspath lbus_rec_path = {
 #define FIRMWARE_VERSIONS 1
 static union firmware_version firmware_versions[] = {
 	{
-	 .firmware.ASIC = 3,.firmware.CODEC = 2,
-	 .firmware.AUXDSP = 3,.firmware.PROG = 773,
+		.firmware = {
+			.ASIC = 3,
+			.CODEC = 2,
+			.AUXDSP = 3,
+			.PROG = 773,
+		},
 	},
 };