Merge branch 'mlxsw-spectrum-Various-fixes'

Jiri Pirko says:

====================
mlxsw: spectrum: Various fixes

First patch adds a missing rollback in error path. Second patch prevents
a use-after-free during IPv4 route replace. Last two patches fix warnings
from static checkers.
====================

Signed-off-by: David S. Miller <[email protected]>