wifi: wil6210: fix sparse warnings

Sparse warns:

drivers/net/wireless/ath/wil6210/fw.c: note: in included file (through drivers/net/wireless/ath/wil6210/wil6210.h):
drivers/net/wireless/ath/wil6210/fw.h:96:47: warning: array of flexible structures
drivers/net/wireless/ath/wil6210/cfg80211.c: note: in included file (through drivers/net/wireless/ath/wil6210/wil6210.h):
drivers/net/wireless/ath/wil6210/fw.h:96:47: warning: array of flexible structures

I decided to remove the combos field altogether and just do pointer arithmetic
instead. Not pretty but I didn't want to waste too much time on an orphaned
driver.

Compile tested only.

Signed-off-by: Kalle Valo <quic_kvalo@quicinc.com>
Link: https://msgid.link/20240320182449.3757215-5-kvalo@kernel.org

drivers/net/wireless/ath/wil6210/cfg80211.c

@@ -2735,7 +2735,7 @@ int wil_cfg80211_iface_combinations_from_fw(
 		return 0;
 	}
 
-	combo = conc->combos;
+	combo = (const struct wil_fw_concurrency_combo *)(conc + 1);
 	n_combos = le16_to_cpu(conc->n_combos);
 	for (i = 0; i < n_combos; i++) {
 		total_limits += combo->n_limits;
@@ -2751,7 +2751,7 @@ int wil_cfg80211_iface_combinations_from_fw(
 		return -ENOMEM;
 	iface_limit = (struct ieee80211_iface_limit *)(iface_combinations +
 						       n_combos);
-	combo = conc->combos;
+	combo = (const struct wil_fw_concurrency_combo *)(conc + 1);
 	for (i = 0; i < n_combos; i++) {
 		iface_combinations[i].max_interfaces = combo->max_interfaces;
 		iface_combinations[i].num_different_channels =

drivers/net/wireless/ath/wil6210/fw.h

@@ -93,7 +93,6 @@ struct wil_fw_record_concurrency { /* type == wil_fw_type_comment */
 	/* number of concurrency combinations that follow */
 	__le16 n_combos;
 	/* keep last - combinations, variable size by n_combos */
-	struct wil_fw_concurrency_combo combos[];
 } __packed;
 
 /* brd file info encoded inside a comment record */

drivers/net/wireless/ath/wil6210/fw_inc.c

@@ -212,8 +212,8 @@ fw_handle_concurrency(struct wil6210_priv *wil, const void *data,
 	}
 
 	n_combos = le16_to_cpu(rec->n_combos);
-	remain = size - offsetof(struct wil_fw_record_concurrency, combos);
-	combo = rec->combos;
+	remain = size - sizeof(struct wil_fw_record_concurrency);
+	combo = (const struct wil_fw_concurrency_combo *)(rec + 1);
 	for (i = 0; i < n_combos; i++) {
 		if (remain < sizeof(*combo))
 			goto out_short;