bcachefs: Make memcpy_to_bio() param const

Signed-off-by: Kent Overstreet <kent.overstreet@gmail.com>
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>

fs/bcachefs/util.c

@@ -556,7 +556,7 @@ size_t bch2_rand_range(size_t max)
 	return rand;
 }
 
-void memcpy_to_bio(struct bio *dst, struct bvec_iter dst_iter, void *src)
+void memcpy_to_bio(struct bio *dst, struct bvec_iter dst_iter, const void *src)
 {
 	struct bio_vec bv;
 	struct bvec_iter iter;

fs/bcachefs/util.h

@@ -539,7 +539,7 @@ do {									\
 
 size_t bch2_rand_range(size_t);
 
-void memcpy_to_bio(struct bio *, struct bvec_iter, void *);
+void memcpy_to_bio(struct bio *, struct bvec_iter, const void *);
 void memcpy_from_bio(void *, struct bio *, struct bvec_iter);
 
 static inline void memcpy_u64s_small(void *dst, const void *src,