If unistd.h is included from any fs include, sound_firmware does not
build because unistd will have been included without __KERNEL_SYSCALLS__
and will not be read again. Easy fix below.

--- linux-2.4.34-wt1/drivers/sound/sound_firmware.c	Sun Oct 22 14:16:52 2006
+++ linux-2.4.34-wt1.pcw/drivers/sound/sound_firmware.c	Sat Feb 17 23:07:03 2007
@@ -1,5 +1,5 @@
-#include "os.h"
 #define __KERNEL_SYSCALLS__
+#include "os.h"
 #include <linux/module.h>
 #include <linux/fs.h>
 #include <linux/mm.h>