ethernet: smc911x: fix indentation in get/set EEPROM

Build bot produced a smatch indentation warning,
the code looks correct but it mixes spaces and tabs.
Reported-by: kernel test robot <lkp@intel.com>
Link: https://lore.kernel.org/r/20220131211730.3940875-1-kuba@kernel.orgSigned-off-by: Jakub Kicinski <kuba@kernel.org>