Merge pull request #3447 from esl/certs

Fix automatic certs rebuild

Makefile

@@ -62,7 +62,7 @@ $(DEVNODES): certs configure.out rel/vars-toml.config
 	DEVNODE=true $(RUN) $(REBAR) as $@ release)
 
 maybe_clean_certs:
-	if [ "$$SKIP_CERT_BUILD" = 1 ]; then \
+	if [ "$$SKIP_CERT_BUILD" != 1 ]; then \
 		if ! openssl x509 -checkend 3600 -noout -in tools/ssl/ca/cacert.pem ; then \
 			cd tools/ssl && make clean_certs; \
 		fi \
@@ -71,7 +71,7 @@ maybe_clean_certs:
 certs: maybe_clean_certs
 	if [ "$$SKIP_CERT_BUILD" = 1 ]; then \
 		echo "Skip cert build"; \
-		else \
+	else \
 		cd tools/ssl && make; \
 	fi