Fixed issue 2278, loop->terminated == true when restarting a loop, al…

…lowing timer callbacks to update loop->timers in place.

src/zloop.c

@@ -709,6 +709,7 @@ zloop_start (zloop_t *self)
 {
     assert (self);
     int rc = 0;
+    self->terminated = false;
 
     //  Main reactor loop
     while (!zsys_interrupted || self->nonstop) {