iiod-client: get_trigger(): Read newline
iiod-client: get_trigger(): Read newline

When the server sends the trigger name it terminates it with a new lines.
Make sure to read it, otherwise we'll upset the internal state of the
client and subsequent commands will read incorrect values for the status
code.

Signed-off-by: Lars-Peter Clausen <3318dc5ce3e4fb7c28a0b841b6801c884e1d0896@metafoo.de>

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