xbps_repository_sync_pkg_index: fix copy/paste in trans err_cb.
xbps_repository_sync_pkg_index: fix copy/paste in trans err_cb.

datenwolf/xbps,ebfe/xbps,ebfe/xbps,datenwolf/xbps,stpx/xbps,ebfe/xbps,datenwolf/xbps,stpx/xbps,stpx/xbps