headers: remove sched.h from poll.h

Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/drivers/char/ipmi/ipmi_devintf.c b/drivers/char/ipmi/ipmi_devintf.c
index 41fc11d..65545de 100644
--- a/drivers/char/ipmi/ipmi_devintf.c
+++ b/drivers/char/ipmi/ipmi_devintf.c
@@ -36,6 +36,7 @@
 #include <linux/errno.h>
 #include <asm/system.h>
 #include <linux/poll.h>
+#include <linux/sched.h>
 #include <linux/spinlock.h>
 #include <linux/slab.h>
 #include <linux/ipmi.h>