Comment 0 for bug 1840932

Commit c33a23ff (selftests: skip seccomp get_metadata test if not real root)

Is causing compilation error for the seccomp test in ubuntu_kernel_selftests:

$ sudo make -C tools/testing/selftests TARGETS=seccomp run_tests
make: Entering directory '/home/jenkins/ubuntu-gke-4.15-bionic/tools/testing/selftests'
make[1]: Entering directory '/home/jenkins/ubuntu-gke-4.15-bionic/tools/testing/selftests/seccomp'
gcc -Wl,-no-as-needed -Wall seccomp_bpf.c -lpthread -o seccomp_bpf
seccomp_bpf.c: In function ‘syscall_restart’:
seccomp_bpf.c:2685:3: warning: implicit declaration of function ‘XFAIL’; did you mean ‘EFAULT’? [-Wimplicit-function-declaration]
   XFAIL(return, "get_metadata requires real root");
   ^~~~~
   EFAULT
seccomp_bpf.c:2685:9: error: expected expression before ‘return’
   XFAIL(return, "get_metadata requires real root");
         ^~~~~~
Makefile:12: recipe for target 'seccomp_bpf' failed
make[1]: *** [seccomp_bpf] Error 1
make[1]: Leaving directory '/home/jenkins/ubuntu-gke-4.15-bionic/tools/testing/selftests/seccomp'
Makefile:73: recipe for target 'all' failed
make: *** [all] Error 2
make: Leaving directory '/home/jenkins/ubuntu-gke-4.15-bionic/tools/testing/selftests'

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: linux-image-4.15.0-1040-gke 4.15.0-1040.42
ProcVersionSignature: Ubuntu 4.15.0-1040.42-gke 4.15.18
Uname: Linux 4.15.0-1040-gke x86_64
ApportVersion: 2.20.9-0ubuntu7.7
Architecture: amd64
Date: Wed Aug 21 14:33:19 2019
ProcEnviron:
 TERM=xterm-256color
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=C.UTF-8
 SHELL=/bin/bash
SourcePackage: linux-signed-gke-4.15
UpgradeStatus: No upgrade log present (probably fresh install)