diff-tree: typefix.

Recent diff_tree_setup_paths() update made it take a second
argument of type "struct diff_options", but we passed another
struct that happenes to have that type at the beginning by
mistake.

Signed-off-by: Junio C Hamano <junkio@cox.net>

diff-tree.c

@@ -120,7 +120,7 @@ int main(int argc, const char **argv)
 	if (opt->diffopt.output_format == DIFF_FORMAT_PATCH)
 		opt->diffopt.recursive = 1;
 
-	diff_tree_setup_paths(get_pathspec(prefix, argv), opt);
+	diff_tree_setup_paths(get_pathspec(prefix, argv), &opt->diffopt);
 	diff_setup_done(&opt->diffopt);
 
 	switch (nr_sha1) {