(rasqal_builtin_agg_expression_execute_reset): Error path [coverity CID 43076]
(rasqal_literal_as_boolean): Handle NULL error_p [coverity CID 45069]
(rasqal_expression_evaluate_concat): Handle NULL error_p [coverity CID 45070]
(rasqal_literal_cast): Handle NULL error_p [coverity CID 45071]
(rasqal_algebra_basic_graph_pattern_to_algebra): Dead code [coverity CID 43015]
(rasqal_algebra_filter_graph_pattern_to_algebra): Dead code [coverity CID 43016]
(rasqal_xsd_timezone_format): Dead code [coverity CID 43018]
(rasqal_xsd_date_compare): Fix NULL date compares [coverity CID 43019]
(rasqal_xsd_datetime_compare2): Fix NULL datetime compares [coverity CID 43020]
(rasqal_algebra_let_graph_pattern_to_algebra): Simplify and fix error path [coverity CID 43021]
(rasqal_new_row_sequence): Tidy error path - dead code [coverity CID 43022]
(rasqal_algebra_service_graph_pattern_to_algebra): Dead code in cleanup [coverity CID 43024]
(rasqal_expression_evaluate_concat): dead code in cleanup [coverity CID 43026]
(rasqal_expression_evaluate_concat): unused var result
(rasqal_builtin_agg_expression_execute_init): cleanup on error path [coverity CID 43027]