am f58f62eb: Merge "libsparse: fix 32 bit overflow when calculating last chunk"

* commit 'f58f62eb31afb59a74566f60683cbbd1099e3111':
  libsparse: fix 32 bit overflow when calculating last chunk
diff --git a/libsparse/sparse.c b/libsparse/sparse.c
index 189b4c0..741e8c6 100644
--- a/libsparse/sparse.c
+++ b/libsparse/sparse.c
@@ -139,7 +139,7 @@
 				DIV_ROUND_UP(backed_block_len(bb), s->block_size);
 	}
 
-	pad = s->len - last_block * s->block_size;
+	pad = s->len - (int64_t)last_block * s->block_size;
 	assert(pad >= 0);
 	if (pad > 0) {
 		write_skip_chunk(out, pad);