Fix BinaryData.read_in bug

src/lib/Collections/BinaryData.vala

@@ -282,6 +282,9 @@ namespace Invercargill {
         }
 
         public bool read_in(Bytes? data, ref size_t amount) throws Error {
+            if(amount <= 0) {
+                return false;
+            }
             if(data == null) {
                 return true;
             }