cnic: Fix an error handling path in 'cnic_alloc_bnx2x_resc()'

All the error handling paths 'goto error', except this one.
We should also go to error in this case, or some resources will be
leaking.

Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Signed-off-by: David S. Miller <davem@davemloft.net>