usbdebug: Cleanup dbgp_ehci_info call

Change-Id: I9cad64796fcfb7a50d9ed9ec95c56ab855c872e3
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: http://review.coreboot.org/3766
Tested-by: build bot (Jenkins)
Reviewed-by: Aaron Durbin <adurbin@google.com>
2 files changed