tests/iio_common: Fix HEX value parsing in sanitize_clamp()

[mhennerich]

Right now iio_reg and possibly other tools are broken.
Registers and values are typically provided in hex values.
strtoul() with base 10 returns error when hex values are parsed.
So iio_reg will always clear register 0 which in most cases will
reset the device.

Signed-off-by: Michael Hennerich [email protected]

[rgetz]

strtoul with base 0 will accept decimal, hex (with leading 0x) and octal (with leading `0).

printf("%lu\n", strtoul("014",NULL,0));
12

as long as that we what we want - that works. Just need to add that to the man pages. (and I agree - adding a -v option to iio_reg print out what it is doing would also be a good idea).