[PATCH 3.19.y-ckt 093/196] drm/i915: fix error path in intel_setup_gmbus()

3.19.8-ckt16 -stable review patch. If anyone has any objections, please let me know. ---8< From: Rasmus Villemoes commit ed3f9fd1e865975ceefdb2a43b453e090b1fd787 upstream. This fails to undo the setup for

[PATCH 3.19.y-ckt 093/196] drm/i915: fix error path in intel_setup_gmbus()

3.19.8-ckt16 -stable review patch. If anyone has any objections, please let me know. ---8< From: Rasmus Villemoes commit ed3f9fd1e865975ceefdb2a43b453e090b1fd787 upstream. This fails to undo the setup for pin==0; moreover,