Fix iio_buffer_start() marked as a "pure" function
Fix iio_buffer_start() marked as a "pure" function

The internal buffer's address does change when using the local backend
with the high-speed mmap interface.

Signed-off-by: Paul Cercueil <73d292422978d45c9eeef455bb1b24a0db453722@analog.com>

sensarliar/libiio,gburca/libiio,sensarliar/libiio,analogdevicesinc/libiio,sensarliar/libiio,Sunderfield/libiio,Sunderfield/libiio,gburca/libiio,gburca/libiio,analogdevicesinc/libiio,analogdevicesinc/libiio,analogdevicesinc/libiio,Sunderfield/libiio