From: Matthew Wilcox <willy@infradead.org>
Date: Wed, 8 Jan 2020 13:59:29 -0800

This waas a mistaken version; please revert and apply v3 instead.

Are you sure?

[davem@localhost net-next]$ git show e102774588b3ac0d221ed2d03a5153e056f1354f >x.diff
[davem@localhost net-next]$ patch -p1 -R <x.diff 
patching file drivers/net/ethernet/3com/3c59x.c
[davem@localhost net-next]$ mv ~/Downloads/V3-net-3com-3c59x-remove-set-but-not-used-variable-mii_reg1.patch ./
[davem@localhost net-next]$ patch -p1 <V3-net-3com-3c59x-remove-set-but-not-used-variable-mii_reg1.patch 
patching file drivers/net/ethernet/3com/3c59x.c
[davem@localhost net-next]$ git diff
[davem@localhost net-next]$

There is no difference in the code of the commit at all between V2 and V3.