[bug] .git/hooks/commit-msg.sample test is reversed

[Federico Fissore <federico@xxxxxxxxxxx>]

Hello everyone

In file commit-msg.sample, grep test is reversed. It greps
'^Signed-off-by: '
while it should grep
'Signed-off-by: '

If you run the sample against attached file, it won't complain. Remove 
the ^ and it will work as expected

Regards

Federico

    Commit message
    
    Signed-off-by: Me <me@xxxxxxxxxxx>
    Signed-off-by: Me <me@xxxxxxxxxxx>