Merge branch 'xen-netfront-xsa-403-follow-on'

Jan Beulich says:

====================
xen-netfront: XSA-403 follow-on

While investigating the XSA, I did notice a few more things. The two
patches aren't really dependent on one another.

1: remove leftover call to xennet_tx_buf_gc()
2: re-order error checks in xennet_get_responses()
====================

Link: https://lore.kernel.org/r/7fca0e44-43b5-8448-3653-249d117dc084@suse.com
Signed-off-by: Paolo Abeni <pabeni@redhat.com>