backflip-from-tsv: Use backflip -x, and handle return code.

Change-Id: I3e499b346f5b243f5ed34997a180b41711b65894
diff --git a/backflip-from-tsv b/backflip-from-tsv
index 1889472..d18eccb 100755
--- a/backflip-from-tsv
+++ b/backflip-from-tsv
@@ -90,7 +90,7 @@
 	    case $linaro in
 		"")
 		    [ $verbose ] && echo "$svn needs to be backported, alone"
-		    echo backflip $svn
+		    echo backflip -x $svn '|| echo failed'
 		    ;;
 		auto)
 		    [$verbose ] && echo "$svn backported automatically, skipping"
@@ -168,6 +168,6 @@
 	    stack[${rev}]=
 	done
 	[ $verbose ] && echo stack: ${backport}
-	echo backflip ${backport}
+	echo backflip -x ${backport} '|| echo failed'
     fi
 done