Fix warning Wdefault-const-init-unsafe (#734)

Author: xiazhvera

source/s2n/s2n_tls_channel_handler.c

@@ -1340,7 +1340,7 @@ static struct aws_channel_handler *s_new_tls_handler(
             (void *)&s2n_handler->handler,
             aws_string_c_str(options->alpn_list));
 
-        const char protocols_cpy[4][128];
+        const char protocols_cpy[4][128] = {{0}};
         AWS_ZERO_ARRAY(protocols_cpy);
         size_t protocols_size = 4;
         if (s_parse_protocol_preferences(options->alpn_list, protocols_cpy, &protocols_size)) {
@@ -1714,7 +1714,7 @@ static struct aws_tls_ctx *s_tls_ctx_new(
 
     if (options->alpn_list) {
         AWS_LOGF_DEBUG(AWS_LS_IO_TLS, "ctx: Setting ALPN list %s", aws_string_c_str(options->alpn_list));
-        const char protocols_cpy[4][128];
+        const char protocols_cpy[4][128] = {{0}};
         AWS_ZERO_ARRAY(protocols_cpy);
         size_t protocols_size = 4;
         if (s_parse_protocol_preferences(options->alpn_list, protocols_cpy, &protocols_size)) {