Merge branch 'rs/plug-leak-in-pack-bitmaps' into maint

The code to read pack-bitmap wanted to allocate a few hundred pointers to a structure, but by mistake allocated and leaked memory enough to hold that many actual structures. Correct the allocation size and also have it on stack, as it is small enough. * rs/plug-leak-in-pack-bitmaps: pack-bitmaps: plug memory leak, fix allocation size for recent_bitmaps