drm/i915: fix an error code in intel_modeset_all_tiles()

There is a cut and paste bug so we return the wrong error code.

Fixes: a603f5bd ("drm/i915/dp: Make sure all tiled connectors get added to the state with full modeset")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Reviewed-by: José Roberto de Souza <jose.souza@intel.com>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Link: https://patchwork.freedesktop.org/patch/msgid/20200107130322.gdk5b6jurifr26c2@kili.mountain

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

@@ -14568,7 +14568,7 @@ intel_modeset_all_tiles(struct intel_atomic_state *state, int tile_grp_id)
 		crtc_state = drm_atomic_get_crtc_state(&state->base,
 						       conn_state->crtc);
 		if (IS_ERR(crtc_state)) {
-			ret = PTR_ERR(conn_state);
+			ret = PTR_ERR(crtc_state);
 			break;
 		}
 		crtc_state->mode_changed = true;