octeontx2-vf: fix bitmap leak

The bitmap allocated with bitmap_zalloc() in otx2vf_probe() was not
released in otx2vf_remove(). Unbinding and rebinding the driver therefore
triggers a kmemleak warning:

    unreferenced object (size 8):
      backtrace:
        bitmap_zalloc
        otx2vf_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_vf.c

@@ -854,6 +854,7 @@ static void otx2vf_remove(struct pci_dev *pdev)
 		qmem_free(vf->dev, vf->dync_lmt);
 	otx2vf_vfaf_mbox_destroy(vf);
 	pci_free_irq_vectors(vf->pdev);
+	bitmap_free(vf->af_xdp_zc_qidx);
 	pci_set_drvdata(pdev, NULL);
 	free_netdev(netdev);
 }