Cleanup decoder backtracking.

Signed-off-by: Stefan Westerfeld <stefan@space.twc.de>

src/convcode.cc

@@ -116,14 +116,13 @@ conv_decode (const vector<int>& coded_bits)
   unsigned int state = 0;
   do
     {
-      int state = error_count[idx][state].last_state;
-      int bit   = error_count[idx][state].bit;
-      decoded_bits.push_back (bit);
+      decoded_bits.push_back (error_count[idx][state].bit);
+
+      state = error_count[idx][state].last_state;
       idx--;
     }
-  while (idx > 1);
+  while (idx > 0);
   std::reverse (decoded_bits.begin(), decoded_bits.end());
-  decoded_bits.push_back (0);
 
   /* remove termination */
   assert (decoded_bits.size() >= order);