Avoid unused variable.

lib/zip_dirent.c

diff --git a/lib/zip_dirent.c b/lib/zip_dirent.c
index 6e380f3..6b268f8 100644
--- a/lib/zip_dirent.c
+++ b/lib/zip_dirent.c
@@ -484,8 +484,7 @@
 	else if (local) {
 	    /* From appnote.txt: This entry in the Local header MUST
 	       include BOTH original and compressed file size fields. */
-	    zip_uint64_t ignore;
-	    ignore = _zip_buffer_get_64(ef_buffer);
+	    (void)_zip_buffer_get_64(ef_buffer);
 	}
 	if (zde->comp_size == ZIP_UINT32_MAX)
 	    zde->comp_size = _zip_buffer_get_64(ef_buffer);