multi & hiper examples: updates and cleanups

all multi and hiper examples:

* don't loop curl_multi_perform calls, that was <7.20.0 style, currently
  the exported multi functions will not return CURLM_CALL_MULTI_PERFORM

all hiper examples:
* renamed check_run_count to check_multi_info
* don't  compare current running handle count with previous value, this
  was the wrong way to check for finished requests, simply call
  curl_multi_info_read
* it's also safe to call curl_multi_remove_handle inside the
  curl_multi_info_read loop.

ghiper.c:
* replaced curl_multi_socket (that function is marked as obsolete) calls
  with curl_multi_socket_action calls (as in hiperfifo.c and
  evhiperfifo.c)

ghiper.c and evhiperfifo.c:
* be smart as hiperfifo.c, don't do uncessary curl_multi_* calls in
  new_conn and main

1 files changed, 1 insertions, 1 deletions

diff --git a/docs/examples/10-at-a-time.c b/docs/examples/10-at-a-time.c
index 51326422c..b215cbfd4 100644
--- a/docs/examples/10-at-a-time.c
+++ b/docs/examples/10-at-a-time.c
@@ -119,7 +119,7 @@ int main(void)
   }
 
   while (U) {
-    while (CURLM_CALL_MULTI_PERFORM == curl_multi_perform(cm, &U));
+    curl_multi_perform(cm, &U);
 
     if (U) {
       FD_ZERO(&R);