greybus: loopback_test: Use timeout argument

Patch "c3b0a32 Loopback_test: use poll instead of inotify"
added a optional argument for the user to specify a timeout value,
but did not use this parameter in the actual poll function. The
default of 30 seconds is always used.

Fix this by actually using the the poll_timeout parameter so the user
can run long tests.
Signed-off-by: Axel Haslam <ahaslam@baylibre.com>
Reviewed-by: Patrick Titiano <ptitiano@baylibre.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>

drivers/staging/greybus/tools/loopback_test.c

@@ -714,7 +714,7 @@ static int wait_for_complete(struct loopback_test *t)
 	int i;
 
 	while (1) {
-		ret = poll(t->fds, t->poll_count, DEFAULT_POLL_TIMEOUT_SEC * 1000);
+		ret = poll(t->fds, t->poll_count, t->poll_timeout * 1000);
 		if (ret == 0) {
 			fprintf(stderr, "Poll timmed out!\n");
 			return -1;