locks: export setlease to filesystems

Export setlease so it can used by filesystems to implement their lease
methods.

Signed-off-by: "J. Bruce Fields" <bfields@citi.umich.edu>
diff --git a/fs/locks.c b/fs/locks.c
index 94f5d80..4c73b85 100644
--- a/fs/locks.c
+++ b/fs/locks.c
@@ -1336,7 +1336,7 @@
  *
  *	Called with kernel lock held.
  */
-static int setlease(struct file *filp, long arg, struct file_lock **flp)
+int setlease(struct file *filp, long arg, struct file_lock **flp)
 {
 	struct file_lock *fl, **before, **my_before = NULL, *lease;
 	struct dentry *dentry = filp->f_path.dentry;
@@ -1421,6 +1421,7 @@
 out:
 	return error;
 }
+EXPORT_SYMBOL(setlease);
 
  /**
  *	vfs_setlease        -       sets a lease on an open file