test-xi2: check return value of list, exit on failure

If list() fails, the server doesn't support XI2 or the device is invalid. In
either case, exit.

Fixes crashes when a nonexisting device is given.

Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>

1 files changed, 5 insertions, 1 deletions

diff --git a/src/test_xi2.c b/src/test_xi2.c
index 9ecfa1d..e7fd99c 100644
--- a/src/test_xi2.c
+++ b/src/test_xi2.c
@@ -324,8 +324,12 @@ test_xi2(Display	*display,
     XIEventMask mask;
     Window win;
     int deviceid = -1;
+    int rc;
+
+    rc = list(display, argc, argv, name, desc);
+    if (rc != EXIT_SUCCESS)
+        return rc;
 
-    list(display, argc, argv, name, desc);
     if (argc >= 1) {
         XIDeviceInfo *info;
         info = xi2_find_device_info(display, argv[0]);