[golan] Add missing iounmap()

Signed-off-by: Wissam Shoukair <wissams@mellanox.com>
Signed-off-by: Michael Brown <mcb30@ipxe.org>

src/drivers/infiniband/golan.c

 	golan_bring_down ( golan );
 err_golan_bringup:
 err_fw_ver_cmdif:
+	iounmap( golan->iseg );
 	golan_free_pages( &golan->pages );
 err_golan_golan_init_pages:
 	free ( golan );
 	}
 
 	golan_bring_down(golan);
-
+	iounmap( golan->iseg );
 	golan_free_pages( &golan->pages );
 	free(golan);
 }