Merge branch 'jk/printf-format'

Code clean-up to avoid using a variable string that compilers may
feel untrustable as printf-style format given to write_file()
helper function.

* jk/printf-format:
  commit.c: remove print_commit_list()
  avoid using sha1_to_hex output as printf format
  walker: let walker_say take arbitrary formats

commit.h

@@ -377,10 +377,6 @@ extern int parse_signed_commit(const struct commit *commit,
 			       struct strbuf *message, struct strbuf *signature);
 extern int remove_signature(struct strbuf *buf);
 
-extern void print_commit_list(struct commit_list *list,
-			      const char *format_cur,
-			      const char *format_last);
-
 /*
  * Check the signature of the given commit. The result of the check is stored
  * in sig->check_result, 'G' for a good signature, 'U' for a good signature