libpayload: Fix compiler warnings

Following warnings occur when compiling with
`i386-elf-gcc (coreboot toolchain v2022-09-18_c8870b1334) 11.2.0`

drivers/serial/8250.c:75: [-Werror=unused-variable]
  Move variable declaration inside the
  `#if !CONFIG(LP_PL011_SERIAL_CONSOLE)` block

drivers/udc/dwc2.c:505: [-Werror=format=]
  use `%zd` to match type `size_t`

Change-Id: Id285c24cba790f181fa203f3117e5df35bed27c4
Signed-off-by: Thomas Heijligen <src@posteo.de>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/69764
Reviewed-by: Eric Lai <eric_lai@quanta.corp-partner.google.com>
Reviewed-by: Nico Huber <nico.h@gmx.de>
Reviewed-by: Felix Singer <felixsinger@posteo.net>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Arthur Heymans <arthur@aheymans.xyz>

0 files changed, 0 insertions, 0 deletions