gfs2: Check for active reservation in gfs2_release

In gfs2_release, check if the inode has an active reservation to avoid
unnecessary lock taking.
Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>

fs/gfs2/file.c

@@ -716,10 +716,10 @@ static int gfs2_release(struct inode *inode, struct file *file)
 	kfree(file->private_data);
 	file->private_data = NULL;
 
-	if (file->f_mode & FMODE_WRITE) {
+	if (gfs2_rs_active(&ip->i_res))
 		gfs2_rs_delete(ip, &inode->i_writecount);
+	if (file->f_mode & FMODE_WRITE)
 		gfs2_qa_put(ip);
-	}
 	return 0;
 }