net/mlx5: remove flow drop useless if branches
net/mlx5: remove flow drop useless if branches

Those two if statements are useless as there is a verification on the drop
field of the flow to jump to the end of the function just above.

Signed-off-by: Nelio Laranjeiro <2f8dd9032d5b85ca4b53dec8ce664eb6998836be@6wind.com>
Acked-by: Shahaf Shuler <59427d49da6f2b944fbf4cb5ee70ef3ac25f744f@mellanox.com>

john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk