grep.c: remove implicit dependency on the_index

diff --git a/cache.h b/cache.h
index 4d014541ab7bc7692919c871a5306543bbf361c5..260e4ee44ad1c80ee0b5490a661c2998426f32e4 100644 (file)
--- a/cache.h
+++ b/cache.h
@@ -703,7 +703,7 @@ extern int unmerged_index(const struct index_state *);
  * provided, the space-separated list of files that differ will be appended
  * to it.
  */
-extern int index_has_changes(const struct index_state *istate,
+extern int index_has_changes(struct index_state *istate,
                             struct tree *tree,
                             struct strbuf *sb);