scsi: fnic: fix msix interrupt allocation

scsi: fnic: fix msix interrupt allocation

[ Upstream commit 3ec24fb4c035e9cbb2f02a48640a09aa913442a2 ]

pci_alloc_irq_vectors() returns number of vectors allocated.  Fix the check
for error condition.

Fixes: cca678dfbad49 ("scsi: fnic: switch to pci_alloc_irq_vectors")
Link: https://lore.kernel.org/r/20190827211340.1095-1-gvaradar@cisco.com
Signed-off-by: Govindarajulu Varadarajan <gvaradar@cisco.com>
Acked-by: Satish Kharat <satishkh@cisco.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>