enetc: Remove mdio bus on PF probe error path

Fixes following kernel panic on the probing error
path, when pci=nomsi bootarg is used (which is
not supporrted by the enetc dirver):

fsl_enetc 0000:00:00.0: MSIX alloc failed
------------[ cut here ]------------
kernel BUG at drivers/net/phy/mdio_bus.c:487!
Internal error: Oops - BUG: 0 [#1] PREEMPT SMP
Modules linked in:
Process swapper/0 (pid: 1, stack limit = 0x(____ptrval____))
CPU: 0 PID: 1 Comm: swapper/0 Not tainted 4.19.68-00004-g85dc4876e6e6 #1
Hardware name: LS1028A RDB Board (DT)
pstate: 80000005 (Nzcv daif -PAN -UAO)
pc : mdiobus_free+0x5c/0x60
lr : _devm_mdiobus_free+0x20/0x30
[...]
Call trace:
 mdiobus_free+0x5c/0x60
 _devm_mdiobus_free+0x20/0x30
 release_nodes+0x148/0x238
 devres_release_all+0x3c/0x68
 really_probe+0x90/0x2a0
 driver_probe_device+0x5c/0x100
 __driver_attach+0xf0/0xf8
 bus_for_each_dev+0x84/0xd8
 driver_attach+0x30/0x40
 bus_add_driver+0x1c4/0x230
 driver_register+0x64/0x110
 __pci_register_driver+0x58/0x68
 enetc_pf_driver_init+0x28/0x30
 do_one_initcall+0x54/0x268
 kernel_init_freeable+0x2d0/0x37c
 kernel_init+0x18/0x118
 ret_from_fork+0x10/0x1c
Code: 97e0dd79 f9400bf3 a8c27bfd d65f03c0 (d4210000)
---[ end trace 1e4e5729f059b773 ]---

Fixes: ebfcb23d62 ("enetc: Add ENETC PF level external MDIO support")
Signed-off-by: Claudiu Manoil <claudiu.manoil@nxp.com>

drivers/net/ethernet/freescale/enetc/enetc_pf.c

@@ -952,6 +952,7 @@ err_alloc_si_res:
 	si->ndev = NULL;
 	free_netdev(ndev);
 err_alloc_netdev:
+	enetc_mdio_remove(pf);
 	enetc_of_put_phy(pf);
 err_map_pf_space:
 	enetc_pci_remove(pdev);