drm/gma500: Free the correct connector allocation

The allocation is made for the gma_connector object so we must use the
same address when free()ing the object.

Signed-off-by: Patrik Jakobsson <patrik.r.jakobsson@gmail.com>
Reviewed-by: Thomas Zimmermann <tzimmermann@suse.de>
Acked-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/20220322131742.11566-5-patrik.r.jakobsson@gmail.com