eliminate compiler warnings from dead assignments

src/lib/connection_add.c

@@ -888,9 +888,8 @@ internal_add_connection (struct MHD_Daemon *daemon,
 #ifdef HAVE_MESSAGES
       MHD_DLOG (daemon,
 		MHD_SC_ITC_USE_FAILED,
-                _("Failed to signal new connection via inter-thread communication channel."));
+                _("Failed to signal new connection via inter-thread communication channel (not necessarily fatal, continuing anyway)."));
 #endif
-      sc = MHD_SC_ITC_USE_FAILED;
     }
   return MHD_SC_OK;
   

src/lib/connection_call_handlers.c

@@ -1307,7 +1307,6 @@ build_header_response (struct MHD_Request *request)
   must_add_keep_alive = false;
   must_add_content_length = false;
   response_has_close = false;
-  response_has_keepalive = false;
   switch (request->state)
     {
     case MHD_REQUEST_FOOTERS_RECEIVED:
@@ -1444,6 +1443,7 @@ build_header_response (struct MHD_Request *request)
       break;
     default:
       mhd_assert (0);
+      return MHD_NO;
     }
 
   if (MHD_CONN_MUST_CLOSE != request->keepalive)

src/lib/daemon_start.c

@@ -761,12 +761,12 @@ setup_thread_pool (struct MHD_Daemon *daemon)
 		    _("Failed to create pool thread: %s\n"),
 		    MHD_strerror_ (errno));
 #endif
-	  sc = MHD_SC_THREAD_POOL_LAUNCH_FAILURE;
 	  /* Free memory for this worker; cleanup below handles
 	   * all previously-created workers. */
 	  if (! daemon->disable_itc)
 	    MHD_itc_destroy_chk_ (d->itc);
 	  MHD_mutex_destroy_chk_ (&d->cleanup_connection_mutex);
+	  sc = MHD_SC_THREAD_POOL_LAUNCH_FAILURE;
 	  goto thread_failed;
 	}
     } /* end for() */
@@ -792,7 +792,7 @@ thread_failed:
      requested. */
   daemon->worker_pool_size = i;
   daemon->listen_socket = MHD_daemon_quiesce (daemon);
-  return MHD_SC_THREAD_LAUNCH_FAILURE;
+  return sc;
 }
 
 

src/microhttpd/connection.c

@@ -1478,7 +1478,6 @@ build_header_response (struct MHD_Connection *connection)
   must_add_keep_alive = MHD_NO;
   must_add_content_length = MHD_NO;
   response_has_close = false;
-  response_has_keepalive = false;
   switch (connection->state)
     {
     case MHD_CONNECTION_FOOTERS_RECEIVED:
@@ -1612,6 +1611,7 @@ build_header_response (struct MHD_Connection *connection)
       break;
     default:
       mhd_assert (0);
+      return MHD_NO;
     }
 
   if (MHD_CONN_MUST_CLOSE != connection->keepalive)