Fix makefile rule when test/vectors.h is missing

`return` only works in functions, so when I run `make check` with no
tests/vectors.h, I get

	return 1
	make: return: Command not found
	make: *** [makefile:189: tests/vectors.h] Error 127

While I guess this does the job, the right thing to do here is `exit 1`.

diff --git a/makefile b/makefile
index bcf9f7e2148d09597dcf6e38100566cfb5dec918..39bb800a3df7248e87c32add44b238fad9a04779 100644 (file)
--- a/makefile
+++ b/makefile
@@ -186,7 +186,7 @@ tests/vectors.h:
        @echo " need libsodium."
        @echo "======================================================"
        @echo ""
-       return 1
+       exit 1
 
 dist: tests/vectors.h
        ./release.sh