ShellPkg: don't call functions with side effects in ASSERT_EFI_ERROR()

ShellPkg: don't call functions with side effects in ASSERT_EFI_ERROR()

When ASSERT_EFI_ERROR() is compiled out, dependent on build flags, only
the status checking should be removed; the function calls should stay.

Cc: Jaben Carsey <jaben.carsey@intel.com>
Cc: Shumin Qiu <shumin.qiu@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Laszlo Ersek <lersek@redhat.com>
Reviewed-by: Giri P Mudusuru <giri.p.mudusuru@intel.com>
Reviewed-by: Jaben Carsey <jaben.carsey@intel.com>