wifi: iwlwifi: fw: fix memory leak in debugfs

Fix a memory leak that occurs when reading the fw_info
file all the way, since we return NULL indicating no
more data, but don't free the status tracking object.

Fixes: 36dfe9ac6e ("iwlwifi: dump api version in yaml format")
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Gregory Greenman <gregory.greenman@intel.com>
Link: https://lore.kernel.org/r/20230418122405.239e501b3b8d.I4268f87809ef91209cbcd748eee0863195e70fa2@changeid
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

drivers/net/wireless/intel/iwlwifi/fw/debugfs.c

@@ -317,8 +317,10 @@ static void *iwl_dbgfs_fw_info_seq_next(struct seq_file *seq,
 	const struct iwl_fw *fw = priv->fwrt->fw;
 
 	*pos = ++state->pos;
-	if (*pos >= fw->ucode_capa.n_cmd_versions)
+	if (*pos >= fw->ucode_capa.n_cmd_versions) {
+		kfree(state);
 		return NULL;
+	}
 
 	return state;
 }