[trunk] API: Error handling for osync_xmlfield_{add, set}_key and osync_xmlfield_sort

[Daniel Gollub-3]

Hi,

to make OSyncXMLField API more stable for the 0.40 soft-freeze following
function got an OSyncError** added to their parameter list:

    * osync_xmlfield_add_key_value
    * osync_xmlfield_set_key_value
    * osync_xmlfield_sort

Additionally the return type got changed from void to osync_bool. On FALSE
check for any error in the OSyncError** struct.

This affects very likely most format plugins which provide conversion
functions to the XMLFormat.


Porting instruction: add an OSyncError** to the function call and check the
return value and handle any error.


Reference Port: http://opensync.org/changeset/5771
(Incomplete port, no complete error handling - see FIXME_ interfaces)

Changeset: http://opensync.org/changeset/5769

Best Regards,
Daniel

--
Daniel Gollub                        Geschaeftsfuehrer: Ralph Dehner
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