drm/probe-helper: put the bridge returned by drm_bridge_chain_get_first_bridge()

The bridge returned by drm_bridge_chain_get_first_bridge() is
refcounted. Put it when done.

Reviewed-by: Maxime Ripard <[e-mail]>
Link: https://lore.kernel.org/r/20250708-drm-bridge-[e-mail]
Signed-off-by: Luca Ceresoli <[e-mail]>

drivers/gpu/drm/drm_probe_helper.c

···
 		*status = drm_bridge_chain_mode_valid(bridge,
 						      &connector->display_info,
 						      mode);
+		drm_bridge_put(bridge);
 		if (*status != MODE_OK) {
 			/* There is also no point in continuing for crtc check
 			 * here. */