net/af_xdp: ensure socket is deleted on Rx queue setup error

net/af_xdp: ensure socket is deleted on Rx queue setup error

The Rx queue setup can fail for many reasons eg. failure to setup the
custom program, failure to allocate or reserve fill queue buffers,
failure to configure busy polling etc. When a failure like one of these
occurs, if the xsk is already set up it should be deleted before
returning. This commit ensures this happens.

Fixes: d8a210774e1d ("net/af_xdp: support unaligned umem chunks")
Fixes: 288a85aef192 ("net/af_xdp: enable custom XDP program loading")
Fixes: 055a393626ed ("net/af_xdp: prefer busy polling")
Fixes: 01fa83c94d7e ("net/af_xdp: workaround custom program loading")
Cc: stable@dpdk.org
Signed-off-by: Ciara Loftus <ciara.loftus@intel.com>