If a Render Node can't be found, we should finish off all child
processes immediately, then return.
Trying to do the check before forking the children results in the test
failing as well, regardless of the status of finding the render node,
which is likely why the forking occurred first in the test's initial
creation. This way we ensure that things finish cleanly before moving to
the next test
Change-Id: I2e1b62fed25c30ff1f179612127c23960da4ee5e
[ROCm/ROCR-Runtime commit: e109ce541c]
Kent Russell
56bbd862e6