ASoC: SOF: Replace zero-length array with flexible-array

There is a regular need in the kernel to provide a way to declare having a
dynamically sized set of trailing elements in a structure. Kernel code should
always use “flexible array members”[1] for these cases. The older style of
one-element or zero-length arrays should no longer be used[2].

[1] https://en.wikipedia.org/wiki/Flexible_array_member
[2] https://github.com/KSPP/linux/issues/21Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org>

sound/soc/sof/probe.h

@@ -36,7 +36,7 @@ struct sof_probe_point_desc {
 struct sof_ipc_probe_dma_add_params {
 	struct sof_ipc_cmd_hdr hdr;
 	unsigned int num_elems;
-	struct sof_probe_dma dma[0];
+	struct sof_probe_dma dma[];
 } __packed;
 
 struct sof_ipc_probe_info_params {
@@ -51,19 +51,19 @@ struct sof_ipc_probe_info_params {
 struct sof_ipc_probe_dma_remove_params {
 	struct sof_ipc_cmd_hdr hdr;
 	unsigned int num_elems;
-	unsigned int stream_tag[0];
+	unsigned int stream_tag[];
 } __packed;
 
 struct sof_ipc_probe_point_add_params {
 	struct sof_ipc_cmd_hdr hdr;
 	unsigned int num_elems;
-	struct sof_probe_point_desc desc[0];
+	struct sof_probe_point_desc desc[];
 } __packed;
 
 struct sof_ipc_probe_point_remove_params {
 	struct sof_ipc_cmd_hdr hdr;
 	unsigned int num_elems;
-	unsigned int buffer_id[0];
+	unsigned int buffer_id[];
 } __packed;
 
 int sof_ipc_probe_init(struct snd_sof_dev *sdev,