Added code to clear "Buffer" before using it. This is supposed to fix the odd issue happened in sscanf.
Added code to clear "Buffer" before using it. This is supposed to fix the odd issue happened in sscanf.

git-svn-id: 5648d1bec6962b0a6d1d1b40eba8cf5cdb62da3d@1648 6f19259b-4bc3-4df7-8a09-765794883524

MattDevo/edk2,MattDevo/edk2,MattDevo/edk2,MattDevo/edk2,MattDevo/edk2,MattDevo/edk2,MattDevo/edk2,MattDevo/edk2