bnx2fc: fix memory leak in bnx2fc_allocate_hash_table()

In case of error, the bnx2fc_allocate_hash_table() didn't free
all the memory it allocated.

Signed-off-by: Maurizio Lombardi <mlombard@redhat.com>
Acked-by: Eddie Wai <eddie.wai@broadcom.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>