Description: xen-netback: don't produce zero-size SKB frags
References:
 https://xenbits.xen.org/xsa/advisory-448.html
Notes:
 carnil> Fixed as well in 6.7.2 for 6.7.y and 6.6.14 for 6.6.y.
Bugs:
upstream: released (6.8-rc2) [c7ec4f2d684e17d69bbdd7c4324db0ef5daac26a]
6.1-upstream-stable: released (6.1.75) [437360133cbd1e9fb88b122e84fff0df08f18e23]
5.10-upstream-stable: released (5.10.209) [cce8ba6fa4ec43ad778d64823a2f8ca120d362c1]
4.19-upstream-stable: released (4.19.306) [5bb8270789c88c0e4ad78c0de2f274f2275c7f6c]
sid: released (6.6.15-1)
6.1-bookworm-security: released (6.1.76-1)
5.10-bullseye-security: released (5.10.209-1)
4.19-buster-security: pending (4.19.309-1)