[PATCH] fix remaining missing includes

Fix more include file problems that surfaced since I submitted the previous
fix-missing-includes.patch.  This should now allow not to include sched.h
from module.h, which is done by a followup patch.

Signed-off-by: Tim Schmielau <tim@physik3.uni-rostock.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
diff --git a/include/linux/sem.h b/include/linux/sem.h
index 106f975..3c1f112 100644
--- a/include/linux/sem.h
+++ b/include/linux/sem.h
@@ -79,6 +79,8 @@
 
 #ifdef __KERNEL__
 
+struct task_struct;
+
 /* One semaphore structure for each semaphore in the system. */
 struct sem {
 	int	semval;		/* current value */