Description: efi/x86/Add missing error handling to old_memmap 1:1 mapping code
References:
 https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git/commit/?id=4e78921ba4dd0aca1cc89168f45039add4183f8e
Notes:
 bwh> All the code involved runs at boot before userland starts, so
 bwh> there is no "denial of service".
Bugs:
upstream: N/A "Invalid issue"
4.19-upstream-stable: N/A "Invalid issue"
4.9-upstream-stable: N/A "Invalid issue"
3.16-upstream-stable: N/A "Invalid issue"
sid: N/A "Invalid issue"
4.9-stretch-security: N/A "Invalid issue"
3.16-jessie-security: N/A "Invalid issue"