Merge branch 'net-stmmac-avoid-unnecessary-work-in-stmmac_release-stmmac_dvr_remove'

Russell King says:

====================
net: stmmac: avoid unnecessary work in stmmac_release()/stmmac_dvr_remove()

This small series is a subset of a RFC I sent earlier. These two
patches remove code that is unnecessary and/or wrong in these paths.
Details in each commit.
====================

Link: https://patch.msgid.link/Z87bpDd7QYYVU0ML@shell.armlinux.org.uk
Signed-off-by: Paolo Abeni <pabeni@redhat.com>