net: bgmac: Fix an erroneous kfree() in bgmac_remove()

'bgmac' is part of a managed resource allocated with bgmac_alloc(). It
should not be freed explicitly.

Remove the erroneous kfree() from the .remove() function.

Fixes: 34a5102c3235 ("net: bgmac: allocate struct bgmac just once & don't copy it")
Signed-off-by: Christophe JAILLET <[e-mail]>
Reviewed-by: Florian Fainelli <[e-mail]>
Link: https://lore.kernel.org/r/a026153108[e-mail]
Signed-off-by: Jakub Kicinski <[e-mail]>

drivers/net/ethernet/broadcom/bgmac-bcma.c

···
 	bcma_mdio_mii_unregister(bgmac->mii_bus);
 	bgmac_enet_remove(bgmac);
 	bcma_set_drvdata(core, NULL);
-	kfree(bgmac);
 }
 
 static struct bcma_driver bgmac_bcma_driver = {