multi use: call multi_perform even on select() timeouts

docs/examples/fopen.c

@@ -180,9 +180,6 @@ fill_buffer(URL_FILE *file,int want,int waittime)
             break;
 
         case 0:
-            break;
-
-        default:
           /* timeout or readable/writable sockets */
           curl_multi_perform(multi_handle, &file->still_running);
           break;

docs/examples/multi-app.c

@@ -101,12 +101,8 @@ int main(int argc, char **argv)
     case -1:
       /* select error */
       break;
-    case 0:
-      /* timeout, do something else */
-      break;
-    default:
-      /* one or more of curl's file descriptors say there's data to read
-         or write */
+    case 0: /* timeout */
+    default: /* action */
       curl_multi_perform(multi_handle, &still_running);
       break;
     }

docs/examples/multi-post.c

@@ -112,7 +112,6 @@ int main(int argc, char *argv[])
         /* select error */
         break;
       case 0:
-        printf("timeout!\n");
       default:
         /* timeout or readable/writable sockets */
         printf("perform!\n");

docs/examples/smtp-multi.c

@@ -174,12 +174,8 @@ int main(void)
     case -1:
       /* select error */
       break;
-    case 0:
-      /* timeout, do something else */
-      break;
-    default:
-      /* one or more of curl's file descriptors say there's data to read
-         or write */
+    case 0: /* timeout */
+    default: /* action */
       curl_multi_perform(mcurl, &still_running);
       break;
     }