test: update test_segfault_recovery to try multiple faults

Reviewed-by: Andreas Schneider <asn@cryptomilk.org>
diff --git a/tests/test_exception_handler.c b/tests/test_exception_handler.c
index 94c6842..3f7c181 100644
--- a/tests/test_exception_handler.c
+++ b/tests/test_exception_handler.c
@@ -22,6 +22,8 @@
 int main(void) {
     const struct CMUnitTest tests[] = {
         cmocka_unit_test(test_segfault_recovery),
+        cmocka_unit_test(test_segfault_recovery),
+        cmocka_unit_test(test_segfault_recovery),
     };
 
     return cmocka_run_group_tests(tests, NULL, NULL);