ShellPkg: Fix ICC11 build failure.

Eliminate SHELL_STATUS and EFI_STATUS mismatch.

Signed-off-by: jcarsey
Reviewed-by: lgao4

git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@13075 6f19259b-4bc3-4df7-8a09-765794883524
1 file changed