[PATCH][next] ASoC: SOF: control.h: Replace zero-length array with DECLARE_FLEX_ARRAY() helper

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Zero-length arrays are deprecated and we are moving towards adopting
C99 flexible-array members, instead. So, replace zero-length arrays
declarations in anonymous union with the new DECLARE_FLEX_ARRAY()
helper macro.

This helper allows for flexible-array members in unions.

Link: https://github.com/KSPP/linux/issues/193
Link: https://github.com/KSPP/linux/issues/211
Link: https://gcc.gnu.org/onlinedocs/gcc/Zero-Length.html
Signed-off-by: Gustavo A. R. Silva <gustavoars@xxxxxxxxxx>
---
 include/sound/sof/control.h | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/include/sound/sof/control.h b/include/sound/sof/control.h
index 7379a33d7247..983d374fe511 100644
--- a/include/sound/sof/control.h
+++ b/include/sound/sof/control.h
@@ -117,11 +117,11 @@ struct sof_ipc_ctrl_data {
 	/* control data - add new types if needed */
 	union {
 		/* channel values can be used by volume type controls */
-		struct sof_ipc_ctrl_value_chan chanv[0];
+		DECLARE_FLEX_ARRAY(struct sof_ipc_ctrl_value_chan, chanv);
 		/* component values used by routing controls like mux, mixer */
-		struct sof_ipc_ctrl_value_comp compv[0];
+		DECLARE_FLEX_ARRAY(struct sof_ipc_ctrl_value_comp, compv);
 		/* data can be used by binary controls */
-		struct sof_abi_hdr data[0];
+		DECLARE_FLEX_ARRAY(struct sof_abi_hdr, data);
 	};
 } __packed;
 
-- 
2.34.1




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