IPC child process should exit and not return

Change-Id: I9b01f473eea1b42cf65c042f89fcf24bfd2ffc0d


[ROCm/ROCR-Runtime commit: 3444da7df6]

projects/rocr-runtime/rocrtst/suites/functional/ipc.cc

@@ -589,6 +589,7 @@ void IPCTest::Run(void) {
     ParentProcessImpl();
   } else {
     ChildProcessImpl();
+    exit(0);
   }
 
   return;