compare_jobs.sh: Exit with status=1 in case of regression or build failure.

Change-Id: I4542116d9903ce70a4df17280e63af8690bf28f1
diff --git a/compare_jobs.sh b/compare_jobs.sh
index 20ea2f0..3684717 100755
--- a/compare_jobs.sh
+++ b/compare_jobs.sh
@@ -209,10 +209,12 @@
 	2) # Regression
 	    color=red
 	    message=FAILED
+	    failed=true
 	    ;;
 	3) # Build failed
 	    color=darkred
 	    message=BUILDFAILED
+	    failed=true
     esac
 
     ${failed} && status=1