[PATCH] bio.c: make bio_destructor static

bio_destructor in fs/bio.c isn't used outside of this file, and after quickly
thinking about it I didn't find a reason why it should.

The patch below makes it static.
Signed-off-by: Adrian Bunk <bunk@stusta.de>
Acked-by: Jens Axboe <axboe@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

fs/bio.c

@@ -91,7 +91,7 @@ static inline struct bio_vec *bvec_alloc(int gfp_mask, int nr, unsigned long *id
 /*
  * default destructor for a bio allocated with bio_alloc()
  */
-void bio_destructor(struct bio *bio)
+static void bio_destructor(struct bio *bio)
 {
 	const int pool_idx = BIO_POOL_IDX(bio);
 	struct biovec_pool *bp = bvec_array + pool_idx;