Fix build fail for VS2005 tool chain.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Eric Dong <eric.dong@intel.com>

git-svn-id: svn://svn.code.sf.net/p/edk2/code/trunk/edk2/MdeModulePkg@15640 6f19259b-4bc3-4df7-8a09-765794883524
Refine the sample for action, should not use text two part.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Eric Dong <eric.dong@intel.com>
Reviewed-by: Liming Gao <liming.gao@intel.com>

git-svn-id: svn://svn.code.sf.net/p/edk2/code/trunk/edk2/MdeModulePkg@15641 6f19259b-4bc3-4df7-8a09-765794883524
Fixed typos: hanlder should be handler.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Chen Fan <chen.fan.fnst@cn.fujitsu.com>
Reviewed-by: Jeff Fan <jeff.fan@intel.com>

git-svn-id: svn://svn.code.sf.net/p/edk2/code/trunk/edk2/MdeModulePkg@15642 6f19259b-4bc3-4df7-8a09-765794883524
The UEFI specification does not say anything when the pointers passed to
WaitForEvent() are NULL.
Passing NULL pointer would cause a segmentation fault in the current code.
This change prevents to get segmentation faults in this case.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Olivier Martin <olivier.martin@arm.com>
Signed-off-by: Feng Tian <feng.tian@intel.com>
Reviewed-by: Liming Gao <liming.gao@intel.com>

git-svn-id: svn://svn.code.sf.net/p/edk2/code/trunk/edk2/MdeModulePkg@15643 6f19259b-4bc3-4df7-8a09-765794883524