usb: ehci-hcd: fix call balance of clocks handling routines

usb: ehci-hcd: fix call balance of clocks handling routines

If the clocks priv->iclk and priv->fclk were not enabled in ehci_hcd_sh_probe,
they should not be disabled in any path.

Conversely, if they was enabled in ehci_hcd_sh_probe, they must be disabled
in all error paths to ensure proper cleanup.

Found by Linux Verification Center (linuxtesting.org) with Klever.

Fixes: 63c845522263 ("usb: ehci-hcd: Add support for SuperH EHCI.")
Cc: stable@vger.kernel.org # ff30bd6a6618: sh: clk: Fix clk_enable() to return 0 on NULL clk
Signed-off-by: Vitalii Mordan <mordan@ispras.ru>
Reviewed-by: Alan Stern <stern@rowland.harvard.edu>
Link: https://lore.kernel.org/r/20241121114700.2100520-1-mordan@ispras.ru
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>