ShellPkg/UefiShellLevel2CommandsLib: Handle the returned error

If this function fails in release build then the error was
not handled and SourceHandle was not valid.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Olivier Martin <olivier.martin@arm.com>
Reviewed-by: Jaben Carsey <jaben.carsey@intel.com>


git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@17184 6f19259b-4bc3-4df7-8a09-765794883524
2 files changed