headers: remove sched.h from poll.h

Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

drivers/isdn/divert/divert_procfs.c

@@ -16,6 +16,7 @@
 #else
 #include <linux/fs.h>
 #endif
+#include <linux/sched.h>
 #include <linux/isdnif.h>
 #include <net/net_namespace.h>
 #include "isdn_divert.h"