compatibleValueRankArrayDimensions/compatibleValueRanks:

- cast compared constant value explicitly so same type like variable operand (signed UA_Int32)
- produced positive falses before

src/server/ua_services_attribute.c

@@ -599,7 +599,7 @@ compatibleValueRankArrayDimensions(UA_Int32 valueRank, size_t arrayDimensionsSiz
             return false;
         break;
     default: /* >= 1: the value is an array with the specified number of dimensions */
-        if(valueRank < 0)
+        if(valueRank < (UA_Int32) 0)
             return false;
         /* Must hold if the array has a defined length. Null arrays (length -1)
          * need to be caught before. */
@@ -624,7 +624,7 @@ compatibleValueRanks(UA_Int32 valueRank, UA_Int32 constraintValueRank) {
             return false;
         break;
     case 0: /* the value is an array with one or more dimensions */
-        if(valueRank < 0)
+        if(valueRank < (UA_Int32) 0)
             return false;
         break;
     default: /* >= 1: the value is an array with the specified number of dimensions */