Fix uninitialized read in MGAEnableSecondOutPut
MGAGRestore
allocated ModeInfo
without initializing its memory and then
passes it into MGAEnableSecondOutPut
via MGAEnableSecondOutPut(pScrn, &ModeInfo);
.
MGAEnableSecondOutPut
then reads the unitialized memory in the line
if ( !(pModeInfo->flSignalMode & POS_HSYNC) )
.
This patch just zeroes the memory to prevent those branches to be randomly taken.