src/soc/skylake: Fix Null pointer dereferences

Fix bug detected by coverity to handle the NULL pointer dereference

Coverity Issues:
* 1379849
* 1379848

TEST=Build and run on skylake platform

Change-Id: Iec7a88a03531bbfeb72cedab5ad93d3a4c23eef5
Signed-off-by: Shaunak Saha <shaunak.saha@intel.com>
Reviewed-on: https://review.coreboot.org/21909
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-by: Furquan Shaikh <furquan@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
1 file changed