How many "food maintenance" related violations did inspection no.1454071 have?
"food maintenance" related refers to category = 'Food Maintenance'; inspection no.1454071 refers to inspection_id = '1454071'
SELECT COUNT(T2.point_id) FROM inspection_point AS T1 INNER JOIN violation AS T2 ON T1.point_id = T2.point_id WHERE T2.inspection_id = '1454071' AND T1.category = 'Food Maintenance'