Fix Buffer::discard must be fluent to be compatible with buffer package (#4)

Author: grachevko

buffer.cc

@@ -189,6 +189,8 @@ PHP_METHOD(ByteBuffer, discard)
     GUARD_SIZE(objval, size);
 
     objval->data->discard(size);
+
+    RETURN_ZVAL(getThis(), 1, 0);
 }
 
 PHP_METHOD(ByteBuffer, slice)

tests/012.phpt

@@ -0,0 +1,18 @@
+--TEST--
+Buffer fluent test
+--SKIPIF--
+<?php
+if (!extension_loaded('buffer')) {
+	echo 'skip';
+}
+?>
+--FILE--
+<?php
+$buffer = new PHPinnacle\Buffer\ByteBuffer('abcd');
+
+echo $buffer->append('e')->bytes() . \PHP_EOL;
+echo $buffer->discard(1)->bytes() . \PHP_EOL;
+?>
+--EXPECT--
+abcde
+bcde