mlt_property.c: update a doxygen comment to label param as out

git-svn-id: https://mlt.svn.sourceforge.net/svnroot/mlt/trunk/mlt@1341 d19143bc-622f-0410-bfdd-b5b2a6649095

diff --git a/src/framework/mlt_property.c b/src/framework/mlt_property.c
index 2e3e1cbc0c8d6c607fd077ca6efbc995c48f4e59..b657bf827698a2587d8b94ee209e8f39034a65e0 100644 (file)
--- a/src/framework/mlt_property.c
+++ b/src/framework/mlt_property.c
@@ -428,7 +428,7 @@ char *mlt_property_get_string( mlt_property this )
  * destructor function.
  * \public \memberof mlt_property_s
  * \param this a property
- * \param[out] length the size of the binary object in bytes
+ * \param[out] length the size of the binary object in bytes (optional)
  * \return an opaque data pointer or NULL if not available
  */