Never run crypto_early_init() more than once

Previously we had set up all the infrastructure to avoid calling it
after the first time, but didn't actually use it.

src/common/crypto.c

@@ -282,6 +282,9 @@ int
 crypto_early_init(void)
 {
   if (!crypto_early_initialized_) {
+
+    crypto_early_initialized_ = 1;
+
     ERR_load_crypto_strings();
     OpenSSL_add_all_algorithms();