[PATCH 3/5] ref-filter.c: add trailer options to used_atom

In preparation for "%(trailers)" to take trailer parsing arguments, use Jeff's
convenience structure for trailer processing options introduced in 8abc89800c.

We will later populate this field from the arguments given to %(trailers), and
then use the trailer_opts instance to format ref trailers correctly using
`format_trailer_from_commit`.

Signed-off-by: Taylor Blau <redacted>
---
 ref-filter.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/ref-filter.c b/ref-filter.c
index 467c0279c..84f14093c 100644
--- a/ref-filter.c
+++ b/ref-filter.c

@@ -82,6 +82,7 @@ static struct used_atom {
 		} remote_ref;
 		struct {
 			enum { C_BARE, C_BODY, C_BODY_DEP, C_LINES, C_SIG, C_SUB, C_TRAILERS } option;
+			struct process_trailer_options trailer_opts;
 			unsigned int nlines;
 		} contents;
 		struct {

-- 
2.14.1.145.gb3622a4ee