Merge branch 'jk/ewah-bounds-check'

The code to read compressed bitmap was not careful to avoid reading
past the end of the file, which has been corrected.

* jk/ewah-bounds-check:
  ewah: adjust callers of ewah_read_mmap()
  ewah_read_mmap: bounds-check mmap reads

pack-bitmap.c

@@ -120,7 +120,7 @@ static struct ewah_bitmap *read_bitmap_1(struct bitmap_index *index)
 {
 	struct ewah_bitmap *b = ewah_pool_new();
 
-	int bitmap_size = ewah_read_mmap(b,
+	ssize_t bitmap_size = ewah_read_mmap(b,
 		index->map + index->map_pos,
 		index->map_size - index->map_pos);