USB: wdm: handle IO errors in wdm_wwan_port_start

In case submitting the URB fails we must undo
what we've done so far.

Fixes: cac6fb01 ("usb: class: cdc-wdm: WWAN framework integration")
Cc: stable <stable@kernel.org>
Signed-off-by: Oliver Neukum <oneukum@suse.com>
Link: https://lore.kernel.org/r/20250401084749.175246-2-oneukum@suse.com


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>