drm/i915/hdcp: Add update_pipe early return

Currently intel_hdcp_update_pipe() is also getting called for non-hdcp
connectors and get through its conditional code flow, which is completely
unnecessary for non-hdcp connectors, therefore it make sense to
have an early return. No functional change.

v2:
- rebased.
Reviewed-by: Uma Shankar <uma.shankar@intel.com>
Signed-off-by: Anshuman Gupta <anshuman.gupta@intel.com>
Reviewed-by: Ramalingam C <ramalingam.c@intel.com>
Signed-off-by: Ramalingam C <ramalingam.c@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200805114521.867-2-anshuman.gupta@intel.com

drivers/gpu/drm/i915/display/intel_hdcp.c

@@ -2082,11 +2082,15 @@ void intel_hdcp_update_pipe(struct intel_atomic_state *state,
 	struct intel_connector *connector =
 				to_intel_connector(conn_state->connector);
 	struct intel_hdcp *hdcp = &connector->hdcp;
-	bool content_protection_type_changed =
+	bool content_protection_type_changed, desired_and_not_enabled = false;
+
+	if (!connector->hdcp.shim)
+		return;
+
+	content_protection_type_changed =
 		(conn_state->hdcp_content_type != hdcp->content_type &&
 		 conn_state->content_protection !=
 		 DRM_MODE_CONTENT_PROTECTION_UNDESIRED);
-	bool desired_and_not_enabled = false;
 
 	/*
 	 * During the HDCP encryption session if Type change is requested,