* engine-gpgsm.c (_gpgme_gpgsm_op_sign): Call
gpgsm_assuan_simple_command with status handlers.
* edit.c (_gpgme_op_edit_start): Check return value of
_gpgme_engine_op_edit.
* import.c (_gpgme_op_import_start): Likewise for
_gpgme_engine_op_import.
* sign.c (_gpgme_op_sign_start): Likewise for
_gpgme_engine_op_sign.
* import.c (append_xml_impinfo): Use
_gpgme_data_append_string_for_xml rather than
_gpgme_data_append_string for the field content.
Submitted by Miguel Coca <e970095@zipi.fi.upm.es>.