ShellPkg: Fix potential memory leak when failing to fully create a structure

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Jaben Carsey <Jaben.carsey@intel.com>
Reviewed-by: Erik Bjorge <erik.c.bjorge@intel.com>


git-svn-id: svn://svn.code.sf.net/p/edk2/code/trunk/edk2/ShellPkg@15423 6f19259b-4bc3-4df7-8a09-765794883524
ShellPkg: Allow opening of root drive nodes

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Jaben Carsey <Jaben.carsey@intel.com>
Reviewed-by: Erik Bjorge <erik.c.bjorge@intel.com>



git-svn-id: svn://svn.code.sf.net/p/edk2/code/trunk/edk2/ShellPkg@15424 6f19259b-4bc3-4df7-8a09-765794883524