drm/i915: Clean up intel_hdcp_disable

drm/i915: Clean up intel_hdcp_disable

Add an out label and un-indent hdcp disable in preparation for
hdcp_mutex. No functional changes

Reviewed-by: Anshuman Gupta <anshuman.gupta@intel.com>
Reviewed-by: Ramalingam C <ramalingam.c@intel.com>
Signed-off-by: Sean Paul <seanpaul@chromium.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20200429195502.39919-9-sean@poorly.run
Link: https://patchwork.freedesktop.org/patch/msgid/20200623155907.22961-9-sean@poorly.run
Changes in v7:
-Split into separate patch (Ramalingam)
Changes in v8:
-None

Signed-off-by: Ramalingam C <ramalingam.c@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200818153910.27894-9-sean@poorly.run