unspec incorrectly used

[rozhuk-im]

+unspec:
+    header->family_transport |= NGX_PROXY_PROTOCOL_V2_FAM_UNSPEC;
+    header->len = 0;

this keep family_transport with NGX_PROXY_PROTOCOL_V2_TRANS_STREAM set.
Also NGX_PROXY_PROTOCOL_V2_FAM_UNSPEC = 0 so this code does nothing.
header->family_transport &= ~NGX_PROXY_PROTOCOL_V2_FAM_MASK; - usually this way used to unset some bits.

I do expect that family_transport = 0, to set both: family and transport to unspec at same time to not confuse parser code.

PS:

typedef struct proxy_protocol_v2_hdr_s {
	uint8_t		sig[12];/* signature hex: 0d 0a 0d 0a 00 0d 0a 51 55 49 54 0a */
	uint8_t		cmd:4;	/* Command. */
	uint8_t		ver:4;	/* Protocol version. */
	uint8_t		type:4;	/* Transport protocol type. */
	uint8_t		af:4;	/* Protocol Address family. */
	uint16_t	len;	/* Number of following bytes part of the header in network endian order. */
} __attribute__((__packed__)) pp2_hdr_t, *pp2_hdr_p;

this definition allow to work with ver/cmd/af/type without bit hacks in code.