* misc fixes

src/backend.c

@@ -138,6 +138,7 @@ f2b_backend_destroy(f2b_backend_t *backend) {
     if (backend->cfg)
       backend->destroy(backend->cfg);
     dlclose(backend->h);
+    backend->h = NULL;
   }
   free(backend);
 }

src/statefile.c

@@ -56,7 +56,7 @@ f2b_statefile_load(f2b_statefile_t *sf) {
   const int fields = 3;
   const char *format = "%48s %u %u"; /* 48 == IPADDR_MAX == sizeof(addr) */
   f2b_ipaddr_t *addrlist = NULL, *ipaddr = NULL;
-  char buf[256], addr[IPADDR_MAX], *p;
+  char buf[256], addr[IPADDR_MAX + 1], *p;
   unsigned int banned_at, release_at;
   FILE *f = NULL;