ieee1394: sbp2: include workqueue.h

Signed-off-by: Stefan Richter <[e-mail]>

drivers/ieee1394/sbp2.c

···
 #include <linux/stringify.h>
 #include <linux/types.h>
 #include <linux/wait.h>
+#include <linux/workqueue.h>
 
 #include <asm/byteorder.h>
 #include <asm/errno.h>