drm/imx: hide an unused label

The imx_drm_bind function causes a warning in linux-next when
CONFIG_DRM_FBDEV_EMULATION is not set:

drivers/gpu/drm/imx/imx-drm-core.c: In function 'imx_drm_bind':
drivers/gpu/drm/imx/imx-drm-core.c:441:1: error: label 'err_unbind' defined but not used [-Werror=unused-label]

I don't understand why the warning only showed up now, as the
code has not been modified recently, but there is an obvious
fix in adding another #if for the symbol.
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Fixes: c1ff5a7a ("drm/imx: Remove local fbdev emulation Kconfig option")
Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>

drivers/gpu/drm/imx/imx-drm-core.c

@@ -436,9 +436,11 @@ static int imx_drm_bind(struct device *dev)
 
 err_fbhelper:
 	drm_kms_helper_poll_fini(drm);
+#if IS_ENABLED(CONFIG_DRM_FBDEV_EMULATION)
 	if (imxdrm->fbhelper)
 		drm_fbdev_cma_fini(imxdrm->fbhelper);
 err_unbind:
+#endif
 	component_unbind_all(drm->dev, drm);
 err_vblank:
 	drm_vblank_cleanup(drm);