lib/scatterlist: use consistent sg_copy_buffer() return type

sg_copy_buffer() returns a size_t with the number of bytes copied.
Return 0 instead of false if the copy is skipped.

Signed-off-by: David Disseldorp <[email protected]>
Reviewed-by: Douglas Gilbert <[email protected]>
Reviewed-by: Johannes Thumshirn <[email protected]>
Signed-off-by: Jens Axboe <[email protected]>

lib/scatterlist.c

@@ -933,7 +933,7 @@ size_t sg_copy_buffer(struct scatterlist *sgl, unsigned int nents, void *buf,
  sg_miter_start(&miter, sgl, nents, sg_flags);
 
  if (!sg_miter_skip(&miter, skip))
- return false;
+ return 0;
 
  while ((offset < buflen) && sg_miter_next(&miter)) {
  unsigned int len;