lib: minor fix to close pull #85
lib: minor fix to close pull #85

dustin-H/multer,tchungdojo/multer,wowzzangga/multer,jg3526/multer,zhaoshiling1017/multer,expressjs/multer,hwqin/multer,ACT1GMR/multer,jacobtomlinson/multer,kangkot/multer,xixilive/multer,ramanujadasu/multer,mixxen/multer,kylev/multer