wifi: cfg80211: fix return value in cfg80211_get_radio_idx_by_chan()

If a valid radio index is not found, the function returns -ENOENT. If the
channel argument itself is invalid, it returns -EINVAL. However, since the
caller only checks for < 0, the distinction between these error codes is
not utilized much. Also, handling these two distinct error codes throughout
the codebase adds complexity, as both cases must be addressed separately. A
subsequent change aims to simplify this by using a single error code for
all invalid cases, making error handling more consistent and streamlined.

To support this change, update the return value to -EINVAL when a valid
radio index is not found. This is still appropriate because, even if the
channel argument is structurally valid, the absence of a corresponding
radio index implies that the argument is effectively invalid—otherwise, a
valid index would have been found.

Signed-off-by: Aditya Kumar Singh <aditya.kumar.singh@oss.qualcomm.com>
Link: https://patch.msgid.link/20250812-fix_scan_ap_flag_requirement_during_mlo-v4-1-383ffb6da213@oss.qualcomm.com
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

Author: Aditya Kumar Singh

include/net/cfg80211.h

@@ -9548,7 +9548,7 @@ int cfg80211_iter_combinations(struct wiphy *wiphy,
  * @wiphy: the wiphy
  * @chan: channel for which the supported radio index is required
  *
- * Return: radio index on success or a negative error code
+ * Return: radio index on success or -EINVAL otherwise
  */
 int cfg80211_get_radio_idx_by_chan(struct wiphy *wiphy,
 				   const struct ieee80211_channel *chan);

net/wireless/util.c

@@ -2584,7 +2584,7 @@ int cfg80211_get_radio_idx_by_chan(struct wiphy *wiphy,
 		}
 	}
 
-	return -ENOENT;
+	return -EINVAL;
 }
 EXPORT_SYMBOL(cfg80211_get_radio_idx_by_chan);