Use nullptr where possible instead of NULL or 0

glslang/MachineIndependent/reflection.cpp

@@ -682,7 +682,7 @@ public:
     }
 
     // For a binary operation indexing into an aggregate, chase down the base of the aggregate.
-    // Return 0 if the topology does not fit this situation.
+    // Return nullptr if the topology does not fit this situation.
     TIntermSymbol* findBase(const TIntermBinary* node)
     {
         TIntermSymbol *base = node->getLeft()->getAsSymbolNode();