[PATCH v2] Bluetooth: Fix code style error

checkpatch.pl flags the zero-length array members in struct
qca_dump_hdr:

    ERROR: Use C99 flexible arrays - see https://docs.kernel.org/process/deprecated.html#zero-length-and-one-element-arrays
    #3110: FILE: drivers/bluetooth/btusb.c:3110:
    + u8 data0[0];

Replace them them with DECLARE_FLEX_ARRAY(), since C99 flexible array
members are not permitted inside unions or as the sole member of
a struct.

The struct layout is unchanged, and everything compiles with the change.

Link: https://docs.kernel.org/process/deprecated.html#zero-length-and-one-element-arrays
Signed-off-by: Jeremy Dean <[email protected]>
---
 drivers/bluetooth/btusb.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/bluetooth/btusb.c b/drivers/bluetooth/btusb.c
index 8f7ed469cac6..b78c4a0e75fd 100644
--- a/drivers/bluetooth/btusb.c
+++ b/drivers/bluetooth/btusb.c
@@ -3103,10 +3103,10 @@ struct qca_dump_hdr {
 	__le16 seqno;
 	u8 reserved;
 	union {
-		u8 data[0];
+		DECLARE_FLEX_ARRAY(u8, data);
 		struct {
 			__le32 ram_dump_size;
-			u8 data0[0];
+			DECLARE_FLEX_ARRAY(u8, data0);
 		} __packed;
 	};
 } __packed;
-- 
2.43.0