fix unchecked nyx_init return value

:Release Notes:
Fix unchecked nyx_init return value

:Detailed Notes:
Coverity issue 11891

:Testing Performed:
Verified that sysmgr-common initializes properly

:QA Notes:

:Issues Addressed:
[ANG-872] Coverity issue in luna-sysmgr-common

Open-webOS-DCO-1.0-Signed-off-by: Eric Blade <eric.blade@lge.com>

Change-Id: I97b2e80f231f2f12258d7aa98dd80d79771048bd
Reviewed-on: https://g2g.palm.com/4514
Reviewed-by: DCO Verification
Tested-by: Eric Blade <eric.blade@lge.com>
Reviewed-by: Eric Blade <eric.blade@lge.com>