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ioctl: Initialize variable before use in ioctl_ReportAgid()

This silences a complaint from the MSVC code analyzer.

--- a/src/ioctl.c

+++ b/src/ioctl.c

@@ -616,7 +616,7 @@

     if( WIN2K ) /* NT/2k/XP */

     {

         ULONG id;

-        DWORD tmp;

+        DWORD tmp = 0;

         i_ret = DeviceIoControl( (HANDLE) i_fd, IOCTL_DVD_START_SESSION,

                         &tmp, 4, &id, sizeof( id ), &tmp, NULL ) ? 0 : -1;