spi: Delete useless checks

Since "res" will never be null, just delete this check.

Signed-off-by: zhang jiao <zhangjiao2@cmss.chinamobile.com>
Link: https://patch.msgid.link/20241112081637.40962-1-zhangjiao2@cmss.chinamobile.com
Signed-off-by: Mark Brown <broonie@kernel.org>

Author: zhang jiao

drivers/spi/spi.c

@@ -984,9 +984,6 @@ static void spi_res_free(void *res)
 {
 	struct spi_res *sres = container_of(res, struct spi_res, data);
 
-	if (!res)
-		return;
-
 	WARN_ON(!list_empty(&sres->entry));
 	kfree(sres);
 }