Merge pull request #29 from ucloud/bugfix_release_ota_fetch

bugfix release ota fetch

uiot/ota/src/ota_client.c

@@ -327,12 +327,12 @@ void IOT_OTA_Clear(void *handle)
     memset(h_ota->url, 0, strlen(h_ota->url));
     memset(h_ota->version, 0, strlen(h_ota->version));    
     memset(h_ota->md5sum, 0, strlen(h_ota->md5sum));
-    h_ota->state = OTA_STATE_UNINITED;
     h_ota->size_last_fetched = 0;
     h_ota->size_fetched = 0;
     h_ota->size_file = 0;    
     ota_lib_md5_deinit(h_ota->md5);    
-    h_ota->md5 = ota_lib_md5_init();
+    h_ota->md5 = ota_lib_md5_init();    
+    h_ota->state = OTA_STATE_INITED;
     return;
 }
 
@@ -454,6 +454,7 @@ int IOT_OTA_FetchYield(void *handle, char *buf, size_t buf_len, size_t range_len
         ret = ofc_fetch(h_ota->ch_fetch, h_ota->size_fetched ,buf, buf_len, range_len, timeout_s);
         /* range download send request too often maybe cutdown by server, need reconnect and continue to download. */
         if(ret == ERR_HTTP_CONN_ERROR) {
+            ofc_deinit(h_ota->ch_fetch);
             h_ota->ch_fetch = ofc_init(h_ota->url);
             ofc_connect(h_ota->ch_fetch);            
             h_ota->state = OTA_STATE_FETCHING;