[S390] Get rid of a lot of sparse warnings.

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
diff --git a/arch/s390/lib/uaccess_pt.c b/arch/s390/lib/uaccess_pt.c
index 49c3e46..24ead55 100644
--- a/arch/s390/lib/uaccess_pt.c
+++ b/arch/s390/lib/uaccess_pt.c
@@ -12,6 +12,7 @@
 #include <linux/mm.h>
 #include <asm/uaccess.h>
 #include <asm/futex.h>
+#include "uaccess.h"
 
 static inline int __handle_fault(struct mm_struct *mm, unsigned long address,
 				 int write_access)