compositor-drm: fix memcmp using a bad pointer in drm_outout_choose_initial_mode

current_mode is already the pointer, taking the address of it is wrong.

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=94562
Reviewed-by: Bryce Harrington <bryce@osg.samsung.com>
[Pekka: rewrote the patch]
Signed-off-by: Pekka Paalanen <pekka.paalanen@collabora.co.uk>

src/compositor-drm.c

@@ -2212,7 +2212,7 @@ drm_output_choose_initial_mode(struct drm_output *output,
 		    height == drm_mode->base.height)
 			configured = drm_mode;
 
-		if (memcmp(&current_mode, &drm_mode->mode_info,
+		if (memcmp(current_mode, &drm_mode->mode_info,
 			   sizeof *current_mode) == 0)
 			current = drm_mode;