drm/sysfb: Remove double assignment to pointer crtc_state

drm/sysfb: Remove double assignment to pointer crtc_state

The declaration of pointer crtc_state includes an assignment to
crtc_state. The double assignment of crtc_state is redundant and
can be removed.

Fixes: 061963cd9e5b ("drm/sysfb: Blit to CRTC destination format")
Signed-off-by: Colin Ian King <colin.i.king@gmail.com>
Reviewed-by: Thomas Zimmermann <tzimmermann@suse.de>
Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Link: https://lore.kernel.org/r/20250903083106.2703580-1-colin.i.king@gmail.com