Fix Terragen loader

Fixes e8d2b840178b2b22336eb02b2535f32f3d5cc37b

code/AssetLib/Terragen/TerragenLoader.cpp

@@ -230,8 +230,8 @@ void TerragenImporter::InternReadFile(const std::string &pFile,
         }
 
         // Get to the next chunk (4 byte aligned)
-        unsigned dtt = reader.GetCurrentPos();
-        if (dtt & 0x3) {
+        unsigned dtt = reader.GetCurrentPos() & 0x3;
+        if (dtt) {
             reader.IncPtr(4 - dtt);
         }
     }