Fix build on Debian8

We cannot use C99 or higher features in C code!

Last lines of build log:
[  265s]    for (unsigned int i = 0; i < decoded_region->num_chans; i++)
[  265s]    ^
[  265s] ipc-driver-test.c:473:3: note: use option -std=c99, -std=gnu99, -std=c11 or -std=gnu11 to compile
your code
[  265s] Makefile:580: recipe for target 'ipc_driver_test-ipc-driver-test.o' failed
[  265s] make[5]: *** [ipc_driver_test-ipc-driver-test.o] Error 1

Change-Id: I80c9cbd77f1cdf323ad2b492de7e9a177840c383
diff --git a/Transceiver52M/device/ipc/ipc-driver-test.c b/Transceiver52M/device/ipc/ipc-driver-test.c
index 2b006f0..44c8b0e 100644
--- a/Transceiver52M/device/ipc/ipc-driver-test.c
+++ b/Transceiver52M/device/ipc/ipc-driver-test.c
@@ -469,9 +469,11 @@
 	while (!ipc_exit_requested)
 		osmo_select_main(0);
 
-	if (global_dev)
-		for (unsigned int i = 0; i < decoded_region->num_chans; i++)
+	if (global_dev) {
+		unsigned int i;
+		for (i = 0; i < decoded_region->num_chans; i++)
 			uhdwrap_stop(global_dev, i);
+	}
 
 	ipc_sock_close(global_ipc_sock_state);
 	return 0;