util/kconfig: Uprev to Linux 6.3's kconfig

Minor bugfix, plus stuff that doesn't really affect us.

TEST=`util/abuild/abuild -C` output (config.h and config.build) remains
the same

Change-Id: I0af0c2ae4cb11bb58457830ffcd8bb8c2422a3d1
Signed-off-by: Patrick Georgi <patrick@coreboot.org>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/79180
Reviewed-by: Martin L Roth <gaumless@gmail.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

util/kconfig/confdata.c

@@ -1269,10 +1269,12 @@ static void (*conf_changed_callback)(void);
 
 void conf_set_changed(bool val)
 {
-	if (conf_changed_callback && conf_changed != val)
-		conf_changed_callback();
+	bool changed = conf_changed != val;
 
 	conf_changed = val;
+
+	if (conf_changed_callback && changed)
+		conf_changed_callback();
 }
 
 bool conf_get_changed(void)