drm/i915/hdcp: Move aux assignment after connector type check

Move assignment of aux after connector type check as port may not
exist if connector is not DPMST.

--v2
-Fix unwanted change in intel_encoder check [Jani]
Signed-off-by: Suraj Kandpal <suraj.kandpal@intel.com>
Reviewed-by: Imre Deak <imre.deak@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240521081458.1500327-2-suraj.kandpal@intel.com

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

@@ -687,7 +687,7 @@ int intel_dp_hdcp_get_remote_capability(struct intel_connector *connector,
 					bool *hdcp2_capable)
 {
 	struct drm_i915_private *i915 = to_i915(connector->base.dev);
-	struct drm_dp_aux *aux = &connector->port->aux;
+	struct drm_dp_aux *aux;
 	u8 bcaps;
 	int ret;
 
@@ -696,6 +696,7 @@ int intel_dp_hdcp_get_remote_capability(struct intel_connector *connector,
 	if (!intel_encoder_is_mst(connector->encoder))
 		return -EINVAL;
 
+	aux = &connector->port->aux;
 	ret =  _intel_dp_hdcp2_get_capability(aux, hdcp2_capable);
 	if (ret)
 		drm_dbg_kms(&i915->drm,