Mutex-protect access to cryptfail.

Totally not sketchy, trust me.

src/sbbs3/ssl.c

@@ -364,6 +364,7 @@ bool do_cryptInit(int (*lprintf)(int level, const char* fmt, ...))
 		return false;
 	}
 	if (!cryptlib_initialized) {
+		pthread_mutex_lock(&ssl_sess_list_mutex);
 		if (cryptfail) {
 			lprintf(LOG_ERR,"cryptInit() returned %d: %s", cryptInit_error, cryptfail);
 			free(cryptfail);
@@ -371,6 +372,7 @@ bool do_cryptInit(int (*lprintf)(int level, const char* fmt, ...))
 		}
 		else
 			lprintf(LOG_ERR,"cryptInit() returned %d", cryptInit_error);
+		pthread_mutex_unlock(&ssl_sess_list_mutex);
 	}
 	return cryptlib_initialized;
 }