Prevent --index-info from ignoring -z.

If git-update-index --index-info -z is used only the first record given to the process will actually be updated as the -z option is ignored until after all index records have been read and processed. This meant that multiple null terminated records were seen as a single record which was lacking a trailing LF, however since the first record ended in a null the C string handling functions ignored the trailing garbage. So --index-info should be required to be the last command line option, much as --stdin is required to be the last command line option. Because --index-info implies --stdin this isn't an issue as the user shouldn't be passing --stdin when also passing --index-info.

---

 update-index.c |    4 +++-
 1 files changed, 3 insertions(+), 1 deletions(-)

base eab8a06b5f0937ead199cbd35950a213486f34eb
last 77565623e6c7a02ead3d080816c761da85421781

index ce1db38..797245a 100644
@@ -577,9 +577,11 @@ int main(int argc, const char **argv)
 				break;
 			}
 			if (!strcmp(path, "--index-info")) {
+				if (i != argc - 1)
+					die("--index-info must be at the end");
 				allow_add = allow_replace = allow_remove = 1;
 				read_index_info(line_termination);
-				continue;
+				break;
 			}
 			if (!strcmp(path, "--ignore-missing")) {
 				not_new = 1;

1.2.3.g5f0e