rtc: cmos: clean up cmos_nvram_read()/cmos_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 <[e-mail]>
Signed-off-by: Alexandre Belloni <[e-mail]>

drivers/rtc/rtc-cmos.c

···
 {
 	int	retval;
 
-	if (unlikely(off >= attr->size))
-		return 0;
-	if (unlikely(off < 0))
-		return -EINVAL;
-	if ((off + count) > attr->size)
-		count = attr->size - off;
-
 	off += NVRAM_OFFSET;
 	spin_lock_irq(&rtc_lock);
 	for (retval = 0; count; count--, off++, retval++) {
···
 	int		retval;
 
 	cmos = dev_get_drvdata(container_of(kobj, struct device, kobj));
-	if (unlikely(off >= attr->size))
-		return -EFBIG;
-	if (unlikely(off < 0))
-		return -EINVAL;
-	if ((off + count) > attr->size)
-		count = attr->size - off;
 
 	/* NOTE:  on at least PCs and Ataris, the boot firmware uses a
 	 * checksum on part of the NVRAM data.  That's currently ignored