multi: remove dns cache creation code from *add_handle

As it is done unconditionally in multi_init() this code will never run!

lib/multi.c

@@ -345,7 +345,6 @@ CURLMcode curl_multi_add_handle(CURLM *multi_handle,
   struct Curl_multi *multi = (struct Curl_multi *)multi_handle;
   struct SessionHandle *data = (struct SessionHandle *)easy_handle;
   struct SessionHandle *new_closure = NULL;
-  struct curl_hash *hostcache = NULL;
 
   /* First, make some basic checks that the CURLM handle is a good handle */
   if(!GOOD_MULTI_HANDLE(multi))
@@ -366,22 +365,11 @@ CURLMcode curl_multi_add_handle(CURLM *multi_handle,
   if(!timeoutlist)
     return CURLM_OUT_OF_MEMORY;
 
-  /* In case multi handle has no hostcache yet, allocate one */
-  if(!multi->hostcache) {
-    hostcache = Curl_mk_dnscache();
-    if(!hostcache) {
-      free(data);
-      Curl_llist_destroy(timeoutlist, NULL);
-      return CURLM_OUT_OF_MEMORY;
-    }
-  }
-
   /* In case multi handle has no closure_handle yet, allocate
      a new easy handle to use when closing cached connections */
   if(!multi->closure_handle) {
     new_closure = (struct SessionHandle *)curl_easy_init();
     if(!new_closure) {
-      Curl_hash_destroy(hostcache);
       free(data);
       Curl_llist_destroy(timeoutlist, NULL);
       return CURLM_OUT_OF_MEMORY;
@@ -403,11 +391,6 @@ CURLMcode curl_multi_add_handle(CURLM *multi_handle,
     multi->closure_handle->state.conn_cache = multi->conn_cache;
   }
 
-  /* In case hostcache has been allocated above,
-     it is associated now with the multi handle. */
-  if(hostcache)
-    multi->hostcache = hostcache;
-
   /* Make easy handle use timeout list initialized above */
   data->state.timeoutlist = timeoutlist;
   timeoutlist = NULL;