[PATCH 16/24] sha1-file.c: let index_path() accept NULL istate

["Nguyễn Thái Ngọc Duy" <pclouds@gmail.com>]

istate is needed for content conversion. Allow to pass NULL istate
(which implies that the caller does not care at all about file content
conversion).

Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
---
 sha1-file.c | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/sha1-file.c b/sha1-file.c
index 5bd11c85bc..214d62f3b5 100644
--- a/sha1-file.c
+++ b/sha1-file.c
@@ -1829,7 +1829,8 @@ static int index_mem(struct index_state *istate,
 	 */
 	if ((type == OBJ_BLOB) && path) {
 		struct strbuf nbuf = STRBUF_INIT;
-		if (convert_to_git(istate, path, buf, size, &nbuf,
+		if (istate &&
+		    convert_to_git(istate, path, buf, size, &nbuf,
 				   get_conv_flags(flags))) {
 			buf = strbuf_detach(&nbuf, &size);
 			re_allocated = 1;
@@ -1957,12 +1958,13 @@ int index_fd(struct index_state *istate, struct object_id *oid,
 	 * Call xsize_t() only when needed to avoid potentially unnecessary
 	 * die() for large files.
 	 */
-	if (type == OBJ_BLOB && path && would_convert_to_git_filter_fd(istate, path))
+	if (type == OBJ_BLOB && path && istate &&
+	    would_convert_to_git_filter_fd(istate, path))
 		ret = index_stream_convert_blob(istate, oid, fd, path, flags);
 	else if (!S_ISREG(st->st_mode))
 		ret = index_pipe(istate, oid, fd, type, path, flags);
 	else if (st->st_size <= big_file_threshold || type != OBJ_BLOB ||
-		 (path && would_convert_to_git(istate, path)))
+		 (path && istate && would_convert_to_git(istate, path)))
 		ret = index_core(istate, oid, fd, xsize_t(st->st_size),
 				 type, path, flags);
 	else
-- 
2.20.0.rc2.486.g9832c05c3d