net: rtl8169: Fix build error when DEBUG is on

When DEBUG_RTL8169 is on, a build error occurs in function
'rtl_init': error: 'dev' undeclared. Fix this.

Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Tom Rini <trini@konsulko.com>
Acked-by: Joe Hershberger <joe.hershberger@ni.com>
1 file changed