use strbuf_addstr() for adding strings to strbufs

Use strbuf_addstr() instead of strbuf_addf() for adding strings.  That's
simpler and makes the intent clearer.

Patch generated by Coccinelle and contrib/coccinelle/strbuf.cocci;
adjusted indentation in refs/packed-backend.c manually.

Signed-off-by: Rene Scharfe <l.s.r@web.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

builtin/branch.c

@@ -352,7 +352,7 @@ static char *build_format(struct ref_filter *filter, int maxwidth, const char *r
 			strbuf_addf(&obname, "%%(objectname:short=%d)", filter->abbrev);
 
 		strbuf_addf(&local, "%%(align:%d,left)%%(refname:lstrip=2)%%(end)", maxwidth);
-		strbuf_addf(&local, "%s", branch_get_color(BRANCH_COLOR_RESET));
+		strbuf_addstr(&local, branch_get_color(BRANCH_COLOR_RESET));
 		strbuf_addf(&local, " %s ", obname.buf);
 
 		if (filter->verbose > 1)

refs/packed-backend.c

@@ -729,8 +729,8 @@ static int write_with_updates(struct packed_ref_store *refs,
 	}
 
 	if (ok != ITER_DONE) {
-		strbuf_addf(err, "unable to write packed-refs file: "
+		strbuf_addstr(err, "unable to write packed-refs file: "
-			    "error iterating over old contents");
+			      "error iterating over old contents");
 		goto error;
 	}
 

sequencer.c

@@ -203,7 +203,7 @@ int sequencer_remove_state(struct replay_opts *opts)
 		free(opts->xopts[i]);
 	free(opts->xopts);
 
-	strbuf_addf(&dir, "%s", get_dir(opts));
+	strbuf_addstr(&dir, get_dir(opts));
 	remove_dir_recursively(&dir, 0);
 	strbuf_release(&dir);