bus/pci: fix generic driver pointer on probe error
bus/pci: fix generic driver pointer on probe error

The field is set but never resetted on error.
This marks the device as being attached while it is not, and forbid
further attempts to hotplug it.

Fixes: 7917d5f5ea46 ("pci: initialize generic driver pointer")
Cc: stable@dpdk.org

Signed-off-by: Gaetan Rivet <a6b9f1aecd7707f01344f211143eb3bcaeb0c5c3@6wind.com>

john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk