Fixed problem of using destroying registered handle in su_root.
Fixed problem of using destroying registered handle in su_root.

This is a bug showing only in win32.

darcs-hash:20060313162940-65a35-42ab5e2a4c2f2d99780e9af5ef7a2b2972442564.gz

xhook/sofia-sip,jart/sofia-sip,erdincay/sofia-sip,jart/sofia-sip,BelledonneCommunications/sofia-sip,BelledonneCommunications/sofia-sip,erdincay/sofia-sip,unispeech/sofia-sip,BelledonneCommunications/sofia-sip,xhook/sofia-sip,xhook/sofia-sip,jart/sofia-sip,unispeech/sofia-sip,unispeech/sofia-sip,xhook/sofia-sip,erdincay/sofia-sip,BelledonneCommunications/sofia-sip,xhook/sofia-sip,erdincay/sofia-sip,unispeech/sofia-sip