network: Fix buffer reuse

iiod_client_open_unlocked() is executed before setup_cancel() is called.
This means the cancellable flag needs to be set to false while running
iiod_client_open_unlocked() otherwise undefined behavior might occur.

The cancellable flag is a per device flag that at the moment is only set to
false then the IIO network context is created and is set to true when a
buffer as been successfully create. This means when creating a buffer for a
device, destroying the buffer and then creating another buffer for the same
device the cancellable flag will be set to true when running
iiod_client_open_unlocked().

To avoid this set cancellable to false when creating a new buffer.

Signed-off-by: Lars-Peter Clausen <[email protected]>

network.c

@@ -739,6 +739,7 @@ static int network_open(const struct iio_device *dev,
 
 	ppdata->io_ctx.fd = ret;
 	ppdata->io_ctx.cancelled = false;
+	ppdata->io_ctx.cancellable = false;
 	ppdata->io_ctx.timeout_ms = DEFAULT_TIMEOUT_MS;
 
 	ret = iiod_client_open_unlocked(pdata->iiod_client,