res_http_websocket.c:301:40: warning: implicit conversion from 'int' to 'char' changes value from 136 to -120 [-Wconstant-conversion]
        frame[0] = AST_WEBSOCKET_OPCODE_CLOSE | 0x80;
                 ~ ~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~
--- res/res_http_websocket.c	(Asterisk 15.2)
+++ res/res_http_websocket.c	(working copy)
@@ -294 +294 @@ int AST_OPTIONAL_API_NAME(ast_websocket_
-	char frame[4] = { 0, }; /* The header is 2 bytes and the reason code takes up another 2 bytes */
+	unsigned char frame[4] = { 0, }; /* The header is 2 bytes and the reason code takes up another 2 bytes */