memtest86+: Get rid of build warnings

- init.c: Gets rid of implicit declaration warnings for functions:
pci_init, find_controller, and coretemp.
- lib.c: Fixes warnings of variables set but not used for hi & lo.
- controller.c: Eliminates warnings about ‘rc’ set but not used.

Change-Id: I1e765dbba2c2e64191ffb2dd9d8c8eda23c6b185
Signed-off-by: Martin Roth <martinroth@google.com>
Reviewed-on: https://review.coreboot.org/13828
Reviewed-by: Ben Gardner <gardner.ben@gmail.com>
3 files changed