further (final?) minor changes for compilation warnings. No change to

* encoding.c, parser.c, relaxng.c: further (final?) minor
  changes for compilation warnings. No change to logic.
diff --git a/relaxng.c b/relaxng.c
index 9c788c2..b1c2e00 100644
--- a/relaxng.c
+++ b/relaxng.c
@@ -6085,7 +6085,7 @@
 	    } else if (cur->depth == -4) {
 		ret = XML_RELAXNG_CONTENT_COMPLEX;
 	    } else {
-		ret = (xmlRelaxNGContentType) cur->depth + 15;
+		ret = (xmlRelaxNGContentType) (cur->depth + 15);
 	    }
 	} else if (cur->type == XML_RELAXNG_ELEMENT) {
 	    /*