`libcrun_container_create()` returns a negative number but no error has been created

[eriksjolund]

If exit_code > 0, then a negative number is returned here

crun/src/libcrun/container.c

Line 3288 in 342775a

return -exit_code;

but no error has been created.
I noticed this when reading the source code.

I haven't checked if exit_code > 0 could happen, though.

[giuseppe]

opened a PR: #1978

let's see what happens in the CI