Index: trunk/Ohana/src/opihi/dvo/mextract.c
===================================================================
--- trunk/Ohana/src/opihi/dvo/mextract.c	(revision 28955)
+++ trunk/Ohana/src/opihi/dvo/mextract.c	(revision 30612)
@@ -68,5 +68,5 @@
   // construct the db Boolean math stack (frees cstack)
   stack = dbRPN (Ncstack, cstack, &Nstack);
-  if ((Ncstack > 0) && (Nstack < 1)) {
+  if (Ncstack && !Nstack) {
     print_error ();
     goto escape;