drm/i915: fix EDID memory leak in SDVO

The EDID returned by drm_get_edid() was never freed.

Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
diff --git a/drivers/gpu/drm/i915/intel_sdvo.c b/drivers/gpu/drm/i915/intel_sdvo.c
index d172e98..d81bb0b 100644
--- a/drivers/gpu/drm/i915/intel_sdvo.c
+++ b/drivers/gpu/drm/i915/intel_sdvo.c
@@ -1692,6 +1692,7 @@
 	edid = intel_sdvo_get_edid(connector);
 	if (edid != NULL && edid->input & DRM_EDID_INPUT_DIGITAL)
 		has_audio = drm_detect_monitor_audio(edid);
+	kfree(edid);
 
 	return has_audio;
 }