vfs: export vfs_ioctl() to modules

This is needed by the stacked ioctl implementation in overlayfs.

Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
diff --git a/fs/ioctl.c b/fs/ioctl.c
index b445b13..3212c292 100644
--- a/fs/ioctl.c
+++ b/fs/ioctl.c
@@ -49,6 +49,7 @@
  out:
 	return error;
 }
+EXPORT_SYMBOL(vfs_ioctl);
 
 static int ioctl_fibmap(struct file *filp, int __user *p)
 {