drm/i915: Don't leak framebuffer_references if drm_framebuffer_init() fails

Don't increment obj->framebuffer_references until we know we actually
managed to create the framebuffer.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: http://patchwork.freedesktop.org/patch/msgid/1452777736-4909-2-git-send-email-ville.syrjala@linux.intel.com

drivers/gpu/drm/i915/intel_display.c

@@ -14905,7 +14905,6 @@ static int intel_framebuffer_init(struct drm_device *dev,
 
 	drm_helper_mode_fill_fb_struct(&intel_fb->base, mode_cmd);
 	intel_fb->obj = obj;
-	intel_fb->obj->framebuffer_references++;
 
 	ret = drm_framebuffer_init(dev, &intel_fb->base, &intel_fb_funcs);
 	if (ret) {
@@ -14913,6 +14912,8 @@ static int intel_framebuffer_init(struct drm_device *dev,
 		return ret;
 	}
 
+	intel_fb->obj->framebuffer_references++;
+
 	return 0;
 }