Fix start-time setreuid complaints.
Fix start-time setreuid complaints.

The code was checking errno instead of the return value from the call.
This fixes calls to setreuid(), setregid(), and setpgid().

Bug 3131052

Change-Id: I8b6155bd4fa9b941895b35fed62cfc163b420fff

xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base