isobusfs: srv: free handle path when closing the handle

The path of an opened file or directory handle is allocated with
strdup() but was not freed when the handle got closed. Every open/close
sequence leaked the path string.

Free the path before clearing the handle.

Assisted-by: Claude:claude-opus-5-5
Signed-off-by: Oliver Hartkopp <socketcan@hartkopp.net>

isobusfs/isobusfs_srv_fa.c

@@ -159,6 +159,7 @@ static int isobusfs_srv_release_handle(struct isobusfs_srv_priv *priv,
 					closedir(hdl->dir);
 				else
 					close(hdl->fd);
+				free(hdl->path);
 				memset(hdl, 0, sizeof(*hdl));
 				priv->handles_count--;
 			}