tests: turn check if manager cannot be intialized into macro

We need to check the same thing in multiple tests. Use a shared
macro to make it easier to update the list of errnos.

Change the errno code for "unitialized cgroup fs" for ENOMEDIUM.
Exec format error looks like something more serious.

This fixes test-execute invocation in mock.

1 files changed, 1 insertions, 1 deletions

diff --git a/src/libsystemd/sd-bus/test-bus-creds.c b/src/libsystemd/sd-bus/test-bus-creds.c
index 500fffc5ce..8003501059 100644
--- a/src/libsystemd/sd-bus/test-bus-creds.c
+++ b/src/libsystemd/sd-bus/test-bus-creds.c
@@ -29,7 +29,7 @@ int main(int argc, char *argv[]) {
         _cleanup_(sd_bus_creds_unrefp) sd_bus_creds *creds = NULL;
         int r;
 
-        if (cg_unified() == -ENOEXEC) {
+        if (cg_unified() == -ENOMEDIUM) {
                 puts("Skipping test: /sys/fs/cgroup/ not available");
                 return EXIT_TEST_SKIP;
         }