This now means "the maximum number of pointers within a bkey" - and
bch_devs_list is updated to use it instead of BCH_REPLICAS_MAX, since
stripes can contain more than BCH_REPLICAS_MAX pointers.
Signed-off-by: Kent Overstreet <kent.overstreet@gmail.com>
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>