python: Fixes --samples argument by multiplying num_samples by sample_size
python: Fixes --samples argument by multiplying num_samples by sample_size

Fixes #714

Signed-off-by: Cormier, Jonathan <94278db6987355808b2e44bbe88db00b9ea77e5a@criticallink.com>

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