[buffer] Use UINT_MAX instead of wrong macro

src/hb-buffer.cc

@@ -860,7 +860,7 @@ hb_buffer_destroy (hb_buffer_t *buffer)
  * @destroy: (nullable): A callback to call when @data is not needed anymore
  * @replace: Whether to replace an existing data with the same key
  *
- * Attaches a user-data key/data pair to the specified buffer. 
+ * Attaches a user-data key/data pair to the specified buffer.
  *
  * Return value: `true` if success, `false` otherwise
  *
@@ -1209,7 +1209,7 @@ hb_buffer_get_flags (const hb_buffer_t *buffer)
  * @cluster_level: The cluster level to set on the buffer
  *
  * Sets the cluster level of a buffer. The #hb_buffer_cluster_level_t
- * dictates one aspect of how HarfBuzz will treat non-base characters 
+ * dictates one aspect of how HarfBuzz will treat non-base characters
  * during shaping.
  *
  * Since: 0.9.42
@@ -1229,7 +1229,7 @@ hb_buffer_set_cluster_level (hb_buffer_t               *buffer,
  * @buffer: An #hb_buffer_t
  *
  * Fetches the cluster level of a buffer. The #hb_buffer_cluster_level_t
- * dictates one aspect of how HarfBuzz will treat non-base characters 
+ * dictates one aspect of how HarfBuzz will treat non-base characters
  * during shaping.
  *
  * Return value: The cluster level of @buffer
@@ -1983,7 +1983,7 @@ hb_buffer_add_codepoints (hb_buffer_t          *buffer,
  * @buffer: An #hb_buffer_t
  * @source: source #hb_buffer_t
  * @start: start index into source buffer to copy.  Use 0 to copy from start of buffer.
- * @end: end index into source buffer to copy.  Use @HB_FEATURE_GLOBAL_END to copy to end of buffer.
+ * @end: end index into source buffer to copy.  Use @UINT_MAX (or ((unsigned int) -1)) to copy to end of buffer.
  *
  * Append (part of) contents of another buffer to this buffer.
  *