Remove extraneous parens around return arguments.

This resolves #540.

test/integration/posix_memalign.c

@@ -120,8 +120,8 @@ TEST_END
 
 int
 main(void) {
-	return (test(
+	return test(
 	    test_alignment_errors,
 	    test_oom_errors,
-	    test_alignment_and_size));
+	    test_alignment_and_size);
 }