MdePkg UefiScsiLib: Close event when SCSI command fails

MdePkg UefiScsiLib: Close event when SCSI command fails

The ScsiExecuteSCSICommand() function in ScsiBusDxe driver will not signal
the event passed from UefiScsiLib when error occurs.

In this case, UefiScsiLib should close the event passing to
ScsiExecuteSCSICommand().

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Hao Wu <hao.a.wu@intel.com>
Reviewed-by: Feng Tian <feng.tian@intel.com>
git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@19448 6f19259b-4bc3-4df7-8a09-765794883524