Fix init script return status

In the original variant, function status() overwrite $rtrn 'in global
scope' which leads to a pretended failing stop() function and
respectively failing initscript when called with action stop.

References: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=686548
Signed-off-by: Christian Schneider <christian.schneider@aoe.com>
Signed-off-by: Christoph Berg <myon@debian.org>