Indent code with TABs

We indent with TABs and sometimes for fine alignment, TABs followed by
spaces, but never all spaces (unless the indentation is less than 8
columns). Indenting with spaces slips through in some places. Fix
them.

Imported code and compat/ are left alone on purpose. The former should
remain as close as upstream as possible. The latter pretty much has
separate maintainers, it's up to them to decide.

Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

cache-tree.c

@@ -448,7 +448,7 @@ int cache_tree_update(struct index_state *istate, int flags)
 }
 
 static void write_one(struct strbuf *buffer, struct cache_tree *it,
-                      const char *path, int pathlen)
+		      const char *path, int pathlen)
 {
 	int i;