Fix the problem with git diff command

Makefile

@@ -73,10 +73,13 @@ bench:
 	$(ECHO_V)$(foreach pkg,$(BENCH_PKGS),go test -bench=. -run="^$$" $(BENCH_FLAGS) $(pkg) | \
 		tee -a $(BENCH_FILE);)
 
-BASELINE_BENCH_FILE=.bench/old.txt
+BASELINE_BENCH_FILE = .bench/old.txt
+# Git diffs can be quote noisy, and contain all sorts of special characters, this just checks
+# if there is anything in the output at all, which is what we want
+GIT_DIFF = $(firstword $(shell git diff master))
 .PHONY: benchbase
 benchbase:
-	$(ECHO_V)if [ -z $(IGNORE_BASELINE_CHECK) ] && [ -z "$(git diff master)" ]; then \
+	$(ECHO_V)if [ -z "$(IGNORE_BASELINE_CHECK)" ] && [ -n "$(GIT_DIFF)" ]; then \
 		echo "$(ERROR_STYLE)Can't record baseline with code changes off master." ; \
 		echo "Check out master and try again$(COLOR_RESET)"; \
 		exit 1; \