m68knommu: include linux/fs.h for do_pipe()

Include linux/fs.h to get the prototype for do_pipe().
Build fix.

Signed-off-by: Greg Ungerer <gerg@uclinux.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/arch/m68knommu/kernel/sys_m68k.c b/arch/m68knommu/kernel/sys_m68k.c
index 48e6b33..15d62c5 100644
--- a/arch/m68knommu/kernel/sys_m68k.c
+++ b/arch/m68knommu/kernel/sys_m68k.c
@@ -18,6 +18,7 @@
 #include <linux/mman.h>
 #include <linux/file.h>
 #include <linux/utsname.h>
+#include <linux/fs.h>
 
 #include <asm/setup.h>
 #include <asm/uaccess.h>