bitmap.h: remove dead artifacts

bitmap_active() no longer exists and BITMAP_ACTIVE is no longer used.
Signed-off-by: Adrian Bunk <bunk@kernel.org>
Cc: Neil Brown <neilb@suse.de>
Cc: "J. Bruce Fields" <bfields@fieldses.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

include/linux/raid/bitmap.h

@@ -138,7 +138,6 @@ typedef __u16 bitmap_counter_t;
 
 /* use these for bitmap->flags and bitmap->sb->state bit-fields */
 enum bitmap_state {
-	BITMAP_ACTIVE = 0x001, /* the bitmap is in use */
 	BITMAP_STALE  = 0x002,  /* the bitmap file is out of date or had -EIO */
 	BITMAP_WRITE_ERROR = 0x004, /* A write error has occurred */
 	BITMAP_HOSTENDIAN = 0x8000,
@@ -258,7 +257,6 @@ struct bitmap {
 int  bitmap_create(mddev_t *mddev);
 void bitmap_flush(mddev_t *mddev);
 void bitmap_destroy(mddev_t *mddev);
-int  bitmap_active(struct bitmap *bitmap);
 
 char *file_path(struct file *file, char *buf, int count);
 void bitmap_print_sb(struct bitmap *bitmap);