headers: remove sched.h from interrupt.h

After m68k's task_thread_info() doesn't refer to current,
it's possible to remove sched.h from interrupt.h and not break m68k!
Many thanks to Heiko Carstens for allowing this.

Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
diff --git a/drivers/ieee1394/raw1394.c b/drivers/ieee1394/raw1394.c
index 0bc3d78..8aa56ac 100644
--- a/drivers/ieee1394/raw1394.c
+++ b/drivers/ieee1394/raw1394.c
@@ -29,6 +29,7 @@
 
 #include <linux/kernel.h>
 #include <linux/list.h>
+#include <linux/sched.h>
 #include <linux/string.h>
 #include <linux/slab.h>
 #include <linux/fs.h>