net/ibmvnic: Fix typo in retry check

This conditional is missing a bang, with the intent
being to break when the retry count reaches zero.

Fixes: 476d96ca

 ("ibmvnic: Bound waits for device queries")
Suggested-by: Juliet Kim <julietk@linux.vnet.ibm.com>
Signed-off-by: Thomas Falcon <tlfalcon@linux.ibm.com>
Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>