The vdev_netvsc driver does periodic detection of PCI devices matched
to the netvsc existed interfaces.
When it finds a match, the PCI address is written to the pipe of the
associated fail-safe PMD instance and a positive value is returned to
the periodic check which is wrongly considered as error.
Change the check to consider only a negative value as error.
Fixes: e7dc5d7becc5 ("net/vdev_netvsc: implement core functionality")
Signed-off-by: Matan Azrad <matan@mellanox.com>
f99b4b07a6