MdeModulePkg/BootLogoLib: Fix GCC build failure

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Ruiyu Ni <ruiyu.ni@intel.com>
Reviewed-by: Feng Tian <feng.tian@intel.com>

git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@18916 6f19259b-4bc3-4df7-8a09-765794883524

MdeModulePkg/Library/BootLogoLib/BootLogoLib.c

@@ -145,6 +145,8 @@ BootLogoEnableLogo (
   NewHeight = 0;
   NewWidth = 0;
   Instance = 0;
+  DestX = 0;
+  DestY = 0;
   while (TRUE) {
     ImageData = NULL;
     ImageSize = 0;