Patch merged into coreboot/master: f4316f8 libpayload: Catch null-pointer dereference in xHCI

the following patch was just integrated into master:
commit f4316f8c101b956af624b0c046c418b4489f6558
Author: Nico Huber 
Date:   Mon Jul 7 17:11:53 2014 +0200

libpayload: Catch null-pointer dereference in xHCI

Fix a possible null-pointer dereference (hopefully) before anyone runs
    into this. Also don't switch ports to xHCI if initialization failed.

Change-Id: I5dbaeb435a98ead0b50d27fde13c9f1433ea3e81
    Signed-off-by: Nico Huber 
    Reviewed-on: http://review.coreboot.org/6245
    Tested-by: build bot (Jenkins)
    Reviewed-by: Edward O'Callaghan 
    Reviewed-by: Paul Menzel

See http://review.coreboot.org/6245 for details.

-gerrit