Curl_socket_check: fix timeout return value for select users

This is the same fix applied for the conditional code that uses select()
that was already done for the poll specific code in commit
b61e8b81.

lib/select.c

@@ -5,7 +5,7 @@
  *                            | (__| |_| |  _ <| |___
  *                             \___|\___/|_| \_\_____|
  *
- * Copyright (C) 1998 - 2011, Daniel Stenberg, <daniel@haxx.se>, et al.
+ * Copyright (C) 1998 - 2012, Daniel Stenberg, <daniel@haxx.se>, et al.
  *
  * This software is licensed as described in the file COPYING, which
  * you should have received as part of this distribution. The terms
@@ -306,8 +306,10 @@ int Curl_socket_check(curl_socket_t readfd0, /* two sockets to read from */
       break;
     if(timeout_ms > 0) {
       pending_ms = timeout_ms - elapsed_ms;
-      if(pending_ms <= 0)
+      if(pending_ms <= 0) {
+        r = 0;  /* Simulate a "call timed out" case */
         break;
+      }
     }
   } while(r == -1);