get_sha1_with_context: always initialize oc->symlink_path

The get_sha1_with_context() function zeroes out the
oc->symlink_path strbuf, but doesn't use strbuf_init() to
set up the usual invariants (like pointing to the slopbuf).
We don't actually write to the oc->symlink_path strbuf
unless we call get_tree_entry_follow_symlinks(), and that
function does initialize it. However, readers may still look
at the zero'd strbuf.

In practice this isn't a triggerable bug. The only caller
that looks at it only does so when the mode we found is 0.
This doesn't happen for non-tree-entries (where we return
S_IFINVALID). A broken tree entry could have a mode of 0,
but canon_mode() quietly rewrites that into S_IFGITLINK.
So the "0" mode should only come up when we did indeed find
a symlink.

This is mostly just an accident of how the code happens to
work, though. Let's future-proof ourselves to make sure the
strbuf is properly initialized for all calls (it's only a
few struct member assignments, not a heap allocation).

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

sha1_name.c

@@ -1511,6 +1511,7 @@ static int get_sha1_with_context_1(const char *name,
 
 	memset(oc, 0, sizeof(*oc));
 	oc->mode = S_IFINVALID;
+	strbuf_init(&oc->symlink_path, 0);
 	ret = get_sha1_1(name, namelen, sha1, flags);
 	if (!ret)
 		return ret;

tree-walk.c

@@ -589,7 +589,6 @@ enum follow_symlinks_result get_tree_entry_follow_symlinks(unsigned char *tree_s
 	int i;
 
 	init_tree_desc(&t, NULL, 0UL);
-	strbuf_init(result_path, 0);
 	strbuf_addstr(&namebuf, name);
 	hashcpy(current_tree_sha1, tree_sha1);