Change type to u8 to allow sanity check agaist 0xff;
Reported-by: NDan Carpenter <dan.carpenter@oracle.com>
Fixes: e87b5039 ("mt76x0: eeprom files")
Signed-off-by: NStanislaw Gruszka <sgruszka@redhat.com>
Signed-off-by: NKalle Valo <kvalo@codeaurora.org>