Remove unused NGTCP2_ERR_UNKNOWN_PKT_TYPE

lib/includes/ngtcp2/ngtcp2.h

@@ -254,7 +254,6 @@ typedef enum ngtcp2_lib_error : int {
 typedef enum ngtcp2_lib_error {
 #endif
   NGTCP2_ERR_INVALID_ARGUMENT = -201,
-  NGTCP2_ERR_UNKNOWN_PKT_TYPE = -202,
   NGTCP2_ERR_NOBUF = -203,
   NGTCP2_ERR_PROTO = -205,
   NGTCP2_ERR_INVALID_STATE = -206,
@@ -1032,8 +1031,6 @@ ngtcp2_pkt_decode_version_cid(uint32_t *pversion, const uint8_t **pdcid,
  *
  * :enum:`NGTCP2_ERR_INVALID_ARGUMENT`
  *     Packet is too short; or it is not a long header
- * :enum:`NGTCP2_ERR_UNKNOWN_PKT_TYPE`
- *     Packet type is unknown
  */
 NGTCP2_EXTERN ngtcp2_ssize ngtcp2_pkt_decode_hd_long(ngtcp2_pkt_hd *dest,
                                                      const uint8_t *pkt,
@@ -1056,8 +1053,6 @@ NGTCP2_EXTERN ngtcp2_ssize ngtcp2_pkt_decode_hd_long(ngtcp2_pkt_hd *dest,
  *
  * :enum:`NGTCP2_ERR_INVALID_ARGUMENT`
  *     Packet is too short; or it is not a short header
- * :enum:`NGTCP2_ERR_UNKNOWN_PKT_TYPE`
- *     Packet type is unknown
  */
 NGTCP2_EXTERN ngtcp2_ssize ngtcp2_pkt_decode_hd_short(ngtcp2_pkt_hd *dest,
                                                       const uint8_t *pkt,

lib/ngtcp2_err.c

@@ -30,8 +30,6 @@ const char *ngtcp2_strerror(int liberr) {
     return "NO_ERROR";
   case NGTCP2_ERR_INVALID_ARGUMENT:
     return "ERR_INVALID_ARGUMENT";
-  case NGTCP2_ERR_UNKNOWN_PKT_TYPE:
-    return "ERR_UNKNOWN_PKT_TYPE";
   case NGTCP2_ERR_NOBUF:
     return "ERR_NOBUF";
   case NGTCP2_ERR_PROTO: