A white man who alleges he was denied a bonus because he fired an African-American subordinate got the go-ahead to pursue a race discrimination case against his former employer.In a written opinion this week, U.S. District Judge Matthew F. Kennelly did not rule on the merits of Stephen J. Trost’s allegations against UPS Ground Freight Inc.But Kennelly rejected the argument that Trost in his lawsuit against the company had not adequately alleged he suffered an adverse employment action under Title VII of the U.S …