Properly report failures in the CUJ scripts

Bug: 318706915
Test: manual test
Change-Id: I25dc7908f354c09cb829070e6de86f6cdfa38dab
diff --git a/tools/perf/benchmarks b/tools/perf/benchmarks
index e188858..05adbe5 100755
--- a/tools/perf/benchmarks
+++ b/tools/perf/benchmarks
@@ -704,6 +704,7 @@
         runner.Run()
     except FatalError:
         sys.stderr.write(f"FAILED\n")
+        sys.exit(1)
 
 
 if __name__ == "__main__":