[PATCH] missing includes in seq_file.h

include/linux/seq_file.h uses memcpy and struct semaphore and so should
include the relevant files.

include/linux/seq_file.h

@@ -3,6 +3,8 @@
 #ifdef __KERNEL__
 
 #include <linux/types.h>
+#include <linux/string.h>
+#include <asm/semaphore.h>
 
 struct seq_operations;
 struct file;