Local backend: Fix local_set_trigger returning -EBUSY if already set
Local backend: Fix local_set_trigger returning -EBUSY if already set

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

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