make valgrind output go into test-specific log file instead of one massive valgrind.log
diff --git a/test/test_bins.sh b/test/test_bins.sh
index f0a3165..e59f9cb 100755
--- a/test/test_bins.sh
+++ b/test/test_bins.sh
@@ -33,7 +33,7 @@
 run_flac ()
 {
 	if [ "$FLAC__VALGRIND" = yes ] ; then
-		valgrind --leak-check=yes --show-reachable=yes --num-callers=100 --logfile-fd=4 flac $* 4>>valgrind.log
+		valgrind --leak-check=yes --show-reachable=yes --num-callers=100 --logfile-fd=4 flac $* 4>>test_bins.valgrind.log
 	else
 		flac $*
 	fi