MunitParameterEnum with NULL value at the beginning leads to segfault

[slinkinone]

MunitParameterEnum is not correctly processed by munit_suite_main. If value parameter is NULL and located at the beginning of the list it will lead to segfault.

static MunitParameterEnum test_params[] = {
  { (char*) "foo", NULL },  // NULL instead of foo_params
  { (char*) "bar", bar_params },
  { (char*) "baz", NULL },
  { NULL, NULL },
};

---

gdb example
run
...
Running test suite with seed 0x9e8678ec...
/example/compare                     [Detaching after fork from child process 20542]
[ OK    ] [ 0.00000232 / 0.00000146 CPU ]
/example/rand                        [Detaching after fork from child process 20543]
[ OK    ] [ 0.00000495 / 0.00000472 CPU ]
/example/parameters                  

Program received signal SIGSEGV, Segmentation fault.
0x0000555555558705 in munit_test_runner_run_test_wild ()
(gdb) bt
#0  0x0000555555558705 in munit_test_runner_run_test_wild ()
#1  0x0000555555558b78 in munit_test_runner_run_test ()
#2  0x0000555555558d45 in munit_test_runner_run_suite ()
#3  0x0000555555558e27 in munit_test_runner_run ()
#4  0x000055555555a05d in munit_suite_main_custom ()
#5  0x000055555555a255 in munit_suite_main ()
#6  0x000055555555adef in main ()