ovl: fix warning

There's a superfluous newline in the warning message in ovl_d_real().
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>

fs/overlayfs/super.c

@@ -335,7 +335,7 @@ static struct dentry *ovl_d_real(struct dentry *dentry,
 	/* Handle recursion */
 	return d_real(real, inode, open_flags);
 bug:
-	WARN(1, "ovl_d_real(%pd4, %s:%lu\n): real dentry not found\n", dentry,
+	WARN(1, "ovl_d_real(%pd4, %s:%lu): real dentry not found\n", dentry,
 	     inode ? inode->i_sb->s_id : "NULL", inode ? inode->i_ino : 0);
 	return dentry;
 }