ASoC: SOF: probes: Replace [0] union members with DECLARE_FLEX_ARRAY()

Replace probes related [0] arrays, all found within unions, with
DECLARE_FLEX_ARRAY() declarations.
Signed-off-by: Jyri Sarha <jyri.sarha@intel.com>
Reviewed-by: Péter Ujfalusi <peter.ujfalusi@linux.intel.com>
Reviewed-by: Kai Vehmanen <kai.vehmanen@linux.intel.com>
Reviewed-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Reviewed-by: Ranjani Sridharan <ranjani.sridharan@linux.intel.com>
Signed-off-by: Péter Ujfalusi <peter.ujfalusi@linux.intel.com>
Link: https://lore.kernel.org/r/20221031105141.19037-2-peter.ujfalusi@linux.intel.comSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/sof/sof-client-probes.c

@@ -13,6 +13,7 @@
 #include <linux/module.h>
 #include <linux/pm_runtime.h>
 #include <linux/string_helpers.h>
+#include <linux/stddef.h>
 
 #include <sound/soc.h>
 #include <sound/sof/header.h>
@@ -59,8 +60,8 @@ struct sof_ipc_probe_info_params {
 	struct sof_ipc_reply rhdr;
 	unsigned int num_elems;
 	union {
-		struct sof_probe_dma dma[0];
-		struct sof_probe_point_desc desc[0];
+		DECLARE_FLEX_ARRAY(struct sof_probe_dma, dma);
+		DECLARE_FLEX_ARRAY(struct sof_probe_point_desc, desc);
 	};
 } __packed;