[GFS2] Remove unused prototype

		   uint64_t lblock, int *new,

		   uint64_t *dblock, uint32_t *extlen);

typedef int (*gfs2_truncator_t) (struct gfs2_inode * ip, uint64_t size);

int gfs2_truncatei(struct gfs2_inode *ip, uint64_t size);

int gfs2_truncatei_resume(struct gfs2_inode *ip);

int gfs2_file_dealloc(struct gfs2_inode *ip);