Migrate ODB files to new error handling

This migrates odb.c, odb_loose.c, odb_pack.c and pack.c to
the new style of error handling.  Also got the unix and win32
versions of map.c.  There are some minor changes to other
files but no others were completely converted.

This also contains an update to filebuf so that a zeroed out
filebuf will not think that the fd (== 0) is actually open
(and inadvertently call close() on fd 0 if cleaned up).

Lastly, this was built and tested on win32 and contains a
bunch of fixes for the win32 build which was pretty broken.

1 files changed, 1 insertions, 0 deletions

diff --git a/src/filebuf.h b/src/filebuf.h
index 5f9d4ad9d..19e17975b 100644
--- a/src/filebuf.h
+++ b/src/filebuf.h
@@ -40,6 +40,7 @@ struct git_filebuf {
 
 	size_t buf_size, buf_pos;
 	git_file fd;
+	bool fd_is_open;
 	int last_error;
 };