pack-bitmap: drop bitmap_index argument from try_partial_reuse()

Starting in commit 0f533c7 (pack-bitmap: read multi-pack bitmaps,
2021-08-31), we no longer look at the "struct bitmap_index" passed to
try_partial_reuse(). This is because we only handle verbatim reuse from
a single pack: either the pack whose bitmap we're looking at, or the
"preferred" pack of a midx bitmap. And thus the primary item we look at
is the "pack" parameter added by that same commit, and not the
bitmap_git->pack parameter (which would be NULL for a midx bitmap). It's
our caller, reuse_partial_packfile_from_bitmap(), which decides which
pack to use and passes it in to us.

Drop the unused parameter to prevent confusion.

Signed-off-by: Jeff King <[email protected]>
Reviewed-by: Taylor Blau <[email protected]>
Signed-off-by: Junio C Hamano <[email protected]>

Author: peff

pack-bitmap.c

@@ -1328,8 +1328,7 @@ struct bitmap_index *prepare_bitmap_walk(struct rev_info *revs,
  * -1 means "stop trying further objects"; 0 means we may or may not have
  * reused, but you can keep feeding bits.
  */
-static int try_partial_reuse(struct bitmap_index *bitmap_git,
-			     struct packed_git *pack,
+static int try_partial_reuse(struct packed_git *pack,
 			     size_t pos,
 			     struct bitmap *reuse,
 			     struct pack_window **w_curs)
@@ -1476,7 +1475,7 @@ int reuse_partial_packfile_from_bitmap(struct bitmap_index *bitmap_git,
 				break;
 
 			offset += ewah_bit_ctz64(word >> offset);
-			if (try_partial_reuse(bitmap_git, pack, pos + offset,
+			if (try_partial_reuse(pack, pos + offset,
 					      reuse, &w_curs) < 0) {
 				/*
 				 * try_partial_reuse indicated we couldn't reuse