octeontx2-pf: fix bitmap leak

The bitmap allocated with bitmap_zalloc() in otx2_probe() was not
released in otx2_remove(). Unbinding and rebinding the driver therefore
triggers a kmemleak warning:

    unreferenced object (size 8):
      backtrace:
        bitmap_zalloc
        otx2_probe

Call bitmap_free() in the remove path to fix the leak.

Fixes: efabce2901 ("octeontx2-pf: AF_XDP zero copy receive support")
Signed-off-by: Bo Sun <bo@mboxify.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

drivers/net/ethernet/marvell/octeontx2/nic/otx2_pf.c

@@ -3542,6 +3542,7 @@ static void otx2_remove(struct pci_dev *pdev)
 	otx2_disable_mbox_intr(pf);
 	otx2_pfaf_mbox_destroy(pf);
 	pci_free_irq_vectors(pf->pdev);
+	bitmap_free(pf->af_xdp_zc_qidx);
 	pci_set_drvdata(pdev, NULL);
 	free_netdev(netdev);
 }