drm/mcde: Fix an error handling path in 'mcde_probe()'

If we don't find any matching components, we should go through the error
handling path, in order to free some resources.

Fixes: ca5be902 ("drm/mcde: Fix uninitialized variable")
Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20190822211518.5578-1-christophe.jaillet@wanadoo.fr