archive-zip:write_zip_entry: Remove second reset of size variable to zero.

It is set to zero just 3 lines before.
Reported by cppcheck.

Signed-off-by: Stefan Beller <stefanbeller@googlemail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

archive-zip.c

@@ -231,7 +231,6 @@ static int write_zip_entry(struct archiver_args *args,
 		size = 0;
 		compressed_size = 0;
 		buffer = NULL;
-		size = 0;
 	} else if (S_ISREG(mode) || S_ISLNK(mode)) {
 		enum object_type type = sha1_object_info(sha1, &size);