libziparchive: fix clang build

Bug: http://b/21558406
Change-Id: I69105a9cde05b182f65c7e574282bb4b48b66e95
Signed-off-by: Greg Hackmann <ghackmann@google.com>
(cherry picked from commit d6eac24aac0069cb6d00d2c723db5adab1a724c4)
1 file changed