net: smc911x: Invert the logic in smc911x_miiphy_{read,write}()

Invert the logic in the aforementioned functions to reduce indent,
no functional change.

Signed-off-by: Marek Vasut <marek.vasut+renesas@gmail.com>
Cc: Joe Hershberger <joe.hershberger@ni.com>
Cc: Masahiro Yamada <yamada.masahiro@socionext.com>
1 file changed