coverity: fix mostly bogus warnings

src/lib/ares_event_poll.c

@@ -75,7 +75,7 @@ static size_t ares_evsys_poll_wait(ares_event_thread_t *e,
   size_t         cnt = 0;
   size_t         i;
 
-  if (num_fds) {
+  if (fdlist != NULL && num_fds) {
     pollfd = ares_malloc_zero(sizeof(*pollfd) * num_fds);
     for (i = 0; i < num_fds; i++) {
       const ares_event_t *ev =

src/lib/ares_search.c

@@ -495,12 +495,12 @@ ares_status_t ares__lookup_hostaliases(const ares_channel_t *channel,
   ares__llist_t      *lines       = NULL;
   ares__llist_node_t *node;
 
-  *alias = NULL;
-
   if (channel == NULL || name == NULL || alias == NULL) {
     return ARES_EFORMERR;
   }
 
+  *alias = NULL;
+
   /* Configuration says to not perform alias lookup */
   if (channel->flags & ARES_FLAG_NOALIASES) {
     return ARES_ENOTFOUND;