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This patch makes Pkcs7VerifyDxe check that it has not already been installed before installing its protocols. This prevents the case where loading it as an external driver (either manually, through Driver#### variables, etc.) will refuse to add a second provider of the API. Contributed-under: TianoCore Contribution Agreement 1.1 Signed-off-by: Peter Jones <pjones@redhat.com> Reviewed-by: Michael Kinney <michael.d.kinney@intel.com> Reviewed-by: Long Qin <qin.long@intel.com>