sb/intel/lynxpoint/pcie.c: Add more checks for NULL pointers

If PCIe root port `n` is disabled, then `rpc.ports[n - 1]` remains NULL.
The existing Lynx Point systems probably don't end up dereferencing
NULL pointers this way. However, it might occur on a system using
Flexible I/O to remap PCIe root ports to other functions.

Tested on an ASRock H81M-HDS and an Acer C720 (Google Peppy). No issues
presented themselves.

Change-Id: I2c22fa36217766c2c4d6e8046f99989063066b16
Signed-off-by: Tristan Corrick <tristan@corrick.kiwi>
Reviewed-on: https://review.coreboot.org/c/30079
Reviewed-by: Arthur Heymans <arthur@aheymans.xyz>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

0 files changed, 0 insertions, 0 deletions