tests: fix unused variable

Signed-off-by: Giuseppe Scrivano <[email protected]>

Author: giuseppe

tests/tests_libcrun_intelrdt.c

@@ -84,6 +84,8 @@ test_get_rdt_value ()
     {                                                    \
       char *result = NULL;                               \
       int r = get_rdt_value (&result, L3, MB, SCHEMATA); \
+      if (strlen (result) != r)                          \
+        return 1;                                        \
       int cmp = strcmp (result, EXPECTED);               \
       free (result);                                     \
       if (cmp != 0)                                      \