fix crash due to buffer overflow

tests/src/TecDummy.cc

@@ -52,7 +52,7 @@ void TecDummy::read(uint8_t bar, uint32_t address, int32_t* data, size_t sizeInB
   assert(reply.size() == nFrames * frameLength);
 
   // convert reply back into byte stream
-  for(size_t i = 0; i < reply.length(); ++i) {
+  for(size_t i = 0; i < reply.length() / 4; ++i) {
     uint32_t word;
     std::memcpy(&word, &(reply[4 * i]), 4);
     reg_command[i] = htonl(word);