pack-bitmap: handle missing bitmap for base MIDX

pack-bitmap: handle missing bitmap for base MIDX

When `prepare_midx_bitmap_git()` is called to load the bitmap for a
chained MIDX's base layer, if the base MIDX does not have an associated
bitmap file (e.g., it was not generated, or was deleted by gc), the
return value is NULL. It is then stored in `bitmap_git->base` and
immediately dereferenced on the next line.

This can happen in practice with incremental MIDX chains: the base MIDX
may have been written without `--write-bitmap-index`, or the bitmap may
have been pruned while the incremental layer's bitmap still references
it.

Check the return value and go to the cleanup label (which unmaps the
current bitmap and returns -1) so the caller falls back to non-bitmap
object enumeration, matching the handling of other bitmap loading
failures in the same function.

Pointed out by Coverity.

Assisted-by: Claude Opus 4.6
Signed-off-by: Johannes Schindelin <redacted>
Signed-off-by: Junio C Hamano <redacted>