Do not fail to start CT if ioprio is unsupported

Some ancient kernels do not support beancounter ioprio
which we try to set in ve_ioprio_set(). We correctly
report about that with a warning, but return an error
code which leads to "CT start failed".

Fix that by adding "return 0" statement.

Signed-off-by: Kir Kolyshkin <kir@openvz.org>
1 file changed