ofp-parse: Improve comment for parse_ofp_packet_out_str().
This function is a wrapper for parse_ofp_packet_out_str__(), which
states that a couple members must be freed on success.  This commit
updates the wrapper's description to indicate the same.
The existing callers appear to be properly freeing members.
Acked-by: Ben Pfaff
@@ -735,7 +735,9 @@ out:
* switch. Returns the set of usable protocols in '*usable_protocols'.
*
* Returns NULL if successful, otherwise a malloc()'d string describing the
- * error. The caller is responsible for freeing the returned string. */
+ * error. The caller is responsible for freeing the returned string.
+ * If successful, both 'po->ofpacts' and 'po->packet' must be free()d by
+ * the caller. */
char * OVS_WARN_UNUSED_RESULT
parse_ofp_packet_out_str(struct ofputil_packet_out *po, const char *str_,
const struct ofputil_port_map *port_map,
