[image] Use image_set_name() only if name != NULL

Signed-off-by: Piotr Jaroszyński <p.jaroszynski@gmail.com>
Signed-off-by: Michael Brown <mcb30@ipxe.org>

src/usr/imgmgmt.c

 		return -ENOMEM;
 
 	/* Set image name */
-	image_set_name ( image, name );
+	if ( name )
+		image_set_name ( image, name );
 
 	/* Set image URI */
 	image_set_uri ( image, uri );