maint: avoid new "make sytnax-check" failure.

* src/diff.h (find_dir_file_pathname): Mark declaration with "extern"
keyword, in order to placate the tight-scope syntax check.

1 files changed, 1 insertions, 1 deletions

diff --git a/src/diff.h b/src/diff.h
index b44a157..578c4ea 100644
--- a/src/diff.h
+++ b/src/diff.h
@@ -335,7 +335,7 @@ extern void print_context_script (struct change *, bool);
 extern int diff_dirs (struct comparison const *,
                       int (*) (struct comparison const *,
                                char const *, char const *));
-char *find_dir_file_pathname (char const *, char const *);
+extern char *find_dir_file_pathname (char const *, char const *);
 
 /* ed.c */
 extern void print_ed_script (struct change *);