Fix #325, remove dead code/compiler warning
Fix #325, remove dead code/compiler warning

With the right compiler flags we get:
./tests/iio_attr.c:529:11: warning: logical 'and' of mutually exclusive tests is always false [-Wlogical-op]

since the code looks like: "if (wbuf && !wbuf)"

This patch removed the offending/dead lines.

Signed-off-by: Robin Getz <c66e5a86ef9317cf35cecb2ed063996b2100ed4b@analog.com>

analogdevicesinc/libiio,analogdevicesinc/libiio,analogdevicesinc/libiio,analogdevicesinc/libiio