fix for return, debug output

Author: Daniel Kroening

src/path-symex/path_symex.cpp

@@ -922,6 +922,7 @@ void path_symext::operator()(
   case RETURN:
     // sets the return value
     state.record_step();
+    state.next_pc();
 
     if(instruction.code.operands().size()==1)
       set_return_value(state, instruction.code.op0());

src/symex/path_search.cpp

@@ -76,7 +76,8 @@ path_searcht::resultt path_searcht::operator()(
       // record we have seen it
       loc_data[state.get_pc().loc_number].visited=true;
 
-      debug() << "Queue: " << queue.size()
+      debug() << "Loc: #" << state.get_pc().loc_number
+              << ", queue: " << queue.size()
               << ", depth: " << state.get_depth();
       for(const auto & s : queue)
         debug() << ' ' << s.get_depth();