test/bench/shootout: fix gccgo binary-list-freelist test

R=r
CC=golang-dev
https://golang.org/cl/6202046

test/bench/shootout/timing.sh

@@ -107,7 +107,7 @@ binarytree() {
 	runonly echo 'binary-tree 15 # too slow to use 20'
 	run 'gcc -O2 binary-tree.c -lm' a.out 15
 	run 'gccgo -O2 binary-tree.go' a.out -n 15
-	run 'gccgo -O2 binary-tree-freelist.go' $O.out -n 15
+	run 'gccgo -O2 binary-tree-freelist.go' a.out -n 15
 	run 'gc binary-tree' $O.out -n 15
 	run 'gc binary-tree-freelist' $O.out -n 15
 }