libpayload/drivers/usb/xhci.c: Check for NULL in xhci_init

Ensure the physical_bar parameter passed to xhci_init is not NULL, else
return NULL.  This may occur when an XHCI controller is disabled and no resources are allocated for it.

BUG=b:284213001

Change-Id: I05c32612606793adcba3f4a5724092387a215d41
Signed-off-by: Fred Reitberger <reitbergerfred@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/75645
Reviewed-by: Jon Murphy <jpmurphy@google.com>
Reviewed-by: Karthik Ramasubramanian <kramasub@google.com>
Reviewed-by: Martin L Roth <gaumless@gmail.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

0 files changed, 0 insertions, 0 deletions