Makefile: Fix the release and feature flag options

Signed-off-by: Alistair Francis <alistair.francis@wdc.com>
diff --git a/Makefile b/Makefile
index 9ec78ce..aed9943 100644
--- a/Makefile
+++ b/Makefile
@@ -23,11 +23,11 @@
 	@echo "Run 'make test' to test any local changes you have made"
 
 ifdef FEATURES
-	features=--features=$(FEATURES)
+features=--features=$(FEATURES)
 endif
 
 ifndef DEBUG
-	release=--release
+release=--release
 endif
 
 .PHONY: setup