coverity: fix resource leak (uri not free()'ed) in network.c

the buffer 'uri' was malloced, and only free'd on the error case.
free it in the normal case.

Signed-off-by: Robin Getz <robin.getz@analog.com>

Author: rgetz

network.c

@@ -1502,6 +1502,7 @@ struct iio_context * network_create_context(const char *host)
 		ctx->description = description;
 	}
 
+	free(uri);
 	iiod_client_set_timeout(pdata->iiod_client, &pdata->io_ctx,
 			calculate_remote_timeout(DEFAULT_TIMEOUT_MS));
 	return ctx;