Fix GCC11 warnings (#326)

Author: graebm

source/websocket.c

@@ -1631,7 +1631,7 @@ void aws_websocket_increment_read_window(struct aws_websocket *websocket, size_t
 int aws_websocket_random_handshake_key(struct aws_byte_buf *dst) {
     /* RFC-6455 Section 4.1.
      * Derive random 16-byte value, base64-encoded, for the Sec-WebSocket-Key header */
-    uint8_t key_random_storage[16];
+    uint8_t key_random_storage[16] = {0};
     struct aws_byte_buf key_random_buf = aws_byte_buf_from_empty_array(key_random_storage, sizeof(key_random_storage));
     int err = aws_device_random_buffer(&key_random_buf);
     if (err) {

source/websocket_encoder.c

@@ -80,7 +80,7 @@ static int s_state_length_byte(struct aws_websocket_encoder *encoder, struct aws
 /* STATE_EXTENDED_LENGTH: Output extended length (state skipped if not using extended length). */
 static int s_state_extended_length(struct aws_websocket_encoder *encoder, struct aws_byte_buf *out_buf) {
     /* Fill tmp buffer with extended-length in network byte order */
-    uint8_t network_bytes_array[8];
+    uint8_t network_bytes_array[8] = {0};
     struct aws_byte_buf network_bytes_buf =
         aws_byte_buf_from_empty_array(network_bytes_array, sizeof(network_bytes_array));
     if (encoder->frame.payload_length <= AWS_WEBSOCKET_2BYTE_EXTENDED_LENGTH_MAX_VALUE) {