Ideally only errors should be output in this mode so fetch
can be run from cron and normally produce no output. Without
this change it would output a single line on each git commit,
e.g.
r1909 = 32ef87860662526d4a62f903949ed21e0341079e (u2_10_12_branch)
Signed-off-by: Simon Arlott <simon@fire.lp0.eu> Acked-by: Eric Wong <normalperson@yhbt.net>