In the /journal/object test, a subprocess is created and at the
end of the child process' code an exit call was made to end it.
For some reason (not sure why) that would generate a leak warning
for the child (generating a negative exit code), making the main
test fail at "g_test_trap_assert_passed". Now instead we simply
return in the child.

Child leak warning when using 'exit()':

==18507==ERROR: LeakSanitizer: detected memory leaks

Direct leak of 32 byte(s) in 1 object(s) allocated from:
    #0 0x7f9b8cccbc88 in realloc (/lib64/libasan.so.5+0xefc88)
    #1 0x7f9b8cb1105d in g_realloc (/lib64/libglib-2.0.so.0+0x5405d)