net/enic: fix L4 Rx ptype comparison

net/enic: fix L4 Rx ptype comparison

For non-UDP/TCP packets, enic may wrongly set PKT_RX_L4_CKSUM_BAD in
ol_flags. The comparison that checks if a packet is UDP or TCP assumes
that RTE_PTYPE_L4 values are bit flags, but they are not. For example,
the following evaluates to true because NONFRAG is 0x600 and UDP is
0x200, and causes the current code to think the packet is UDP.

!!(RTE_PTYPE_L4_NONFRAG & RTE_PTYPE_L4_UDP)

So, fix this by comparing the packet type against UDP and TCP
individually.

Fixes: 453d15059b58 ("net/enic: use new Rx checksum flags")
Cc: stable@dpdk.org
Signed-off-by: Hyong Youb Kim <hyonkim@cisco.com>
Reviewed-by: John Daley <johndale@cisco.com>