[PATCH net] selftests/net: rxtimestamp: Fix an off by one

[Dan Carpenter]

The > should be >= so that we don't write one element beyond the end of
the array.

Fixes: 16e781224198 ("selftests/net: Add a test to validate behavior of rx 
timestamps")
Signed-off-by: Dan Carpenter <dan.carpen...@oracle.com>

diff --git a/tools/testing/selftests/networking/timestamping/rxtimestamp.c 
b/tools/testing/selftests/networking/timestamping/rxtimestamp.c
index 00f286661dcd..dd4162fc0419 100644
--- a/tools/testing/selftests/networking/timestamping/rxtimestamp.c
+++ b/tools/testing/selftests/networking/timestamping/rxtimestamp.c
@@ -341,7 +341,7 @@ int main(int argc, char **argv)
                        return 0;
                case 'n':
                        t = atoi(optarg);
-                       if (t > ARRAY_SIZE(test_cases))
+                       if (t >= ARRAY_SIZE(test_cases))
                                error(1, 0, "Invalid test case: %d", t);
                        all_tests = false;
                        test_cases[t].enabled = true;