[win32] ping ; avoid log when no reply

cosmetics ; sporadically when ping times out with no reply GetLastError() may return IP_REQ_TIMED_OUT which has same value as WSA_QOS_ADMISSION_FAILURE and FormatMessage() therefore generates a non-sensical message "Error due to lack of resources"

ref also ; http://forum.xbmc.org/showthread.php?tid=124340&pid=1440588#pid1440588