updated for BE6 build

src/pke/lib/nullscheme.h

@@ -850,10 +850,10 @@ class LPAlgorithmSHENull : public LPSHEAlgorithm<Element> {
 				for (int c1e = 0; c1e<ringdim; c1e++) {
 					typename Element::PolyType::Integer answer, c1val, c2val, prod;
 					c1val = c1.at(c1e);
-					if (c1val != 0) {
+					if (c1val != typename Element::PolyType::Integer(0)) {
 						for (int c2e = 0; c2e<ringdim; c2e++) {
 							c2val = c2.at(c2e);
-							if (c2val != 0) {
+							if (c2val != typename Element::PolyType::Integer(0)) {
 								prod = c1val * c2val;
 
 								int index = (c1e + c2e);