rtc: ds1343: clean up ds1343_nvram_read()/ds1343_nvram_write()
rtc: ds1343: clean up ds1343_nvram_read()/ds1343_nvram_write()

The change removes redundant sysfs binary file boundary checks, since
this task is already done on caller side in fs/sysfs/file.c

Signed-off-by: Vladimir Zapolskiy <cab8e3b5e86fec6508364ac368c160d09cd3a3dc@mleia.com>
Signed-off-by: Alexandre Belloni <a7228e626ecf0022ac91fc1cd8db88e71d0e5e0e@free-electrons.com>

KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs