msw: fix format string
msw: fix format string

(cherry picked from commit e8ab8fb6b40d315632da311de7a2e03002a528c5)

jomanmuk/vlc-2.2,jomanmuk/vlc-2.2,jomanmuk/vlc-2.2,jomanmuk/vlc-2.2,jomanmuk/vlc-2.2,jomanmuk/vlc-2.2,jomanmuk/vlc-2.2