Remove some OPENSSL_NO_ASYNC guards in init

When config'd with "no-async" the ASYNC_NULL implementation is used, so
async symbols still exist. We should still init the NULL implementation so
that when we get the async ctx it is NULL rather than undefined.
Reviewed-by: NRich Salz <rsalz@openssl.org>

crypto/init.c

@@ -220,7 +220,6 @@ static void ossl_init_no_config(void)
     config_inited = 1;
 }
 
-#ifndef OPENSSL_NO_ASYNC
 static CRYPTO_ONCE async = CRYPTO_ONCE_STATIC_INIT;
 static int async_inited = 0;
 static void ossl_init_async(void)
@@ -231,7 +230,6 @@ static void ossl_init_async(void)
     async_init();
     async_inited = 1;
 }
-#endif
 
 #ifndef OPENSSL_NO_ENGINE
 static CRYPTO_ONCE engine_openssl = CRYPTO_ONCE_STATIC_INIT;
@@ -339,7 +337,6 @@ static void ossl_init_thread_stop(struct thread_local_inits_st *locals)
     if (locals == NULL)
         return;
 
-#ifndef OPENSSL_NO_ASYNC
     if (locals->async) {
 #ifdef OPENSSL_INIT_DEBUG
         fprintf(stderr, "OPENSSL_INIT: ossl_init_thread_stop: "
@@ -347,7 +344,6 @@ static void ossl_init_thread_stop(struct thread_local_inits_st *locals)
 #endif
         ASYNC_cleanup_thread();
     }
-#endif
 
     if (locals->err_state) {
 #ifdef OPENSSL_INIT_DEBUG
@@ -437,7 +433,6 @@ void OPENSSL_cleanup(void)
     }
 #endif
 
-#ifndef OPENSSL_NO_ASYNC
     if (async_inited) {
 # ifdef OPENSSL_INIT_DEBUG
         fprintf(stderr, "OPENSSL_INIT: OPENSSL_cleanup: "
@@ -445,7 +440,6 @@ void OPENSSL_cleanup(void)
 # endif
         async_deinit();
     }
-#endif
 
     if (load_crypto_strings_inited) {
 #ifdef OPENSSL_INIT_DEBUG
@@ -565,11 +559,10 @@ int OPENSSL_init_crypto(uint64_t opts, const OPENSSL_INIT_SETTINGS *settings)
             return 0;
     }
 
-#ifndef OPENSSL_NO_ASYNC
     if ((opts & OPENSSL_INIT_ASYNC)
             && !CRYPTO_THREAD_run_once(&async, ossl_init_async))
         return 0;
-#endif
+
 #ifndef OPENSSL_NO_ENGINE
     if ((opts & OPENSSL_INIT_ENGINE_OPENSSL)
             && !CRYPTO_THREAD_run_once(&engine_openssl,