Avoid non-ANSI function declarations

Sparse says things like:

	warning: non-ANSI function declaration of function 'calc_ttl'

Signed-off-by: John Keeping <john@keeping.me.uk>

1 files changed, 1 insertions, 1 deletions

diff --git a/cgit.c b/cgit.c
index 0ad8171..c16ed8c 100644
--- a/cgit.c
+++ b/cgit.c
@@ -1013,7 +1013,7 @@ static void cgit_parse_args(int argc, const char **argv)
         }
 }
 
-static int calc_ttl()
+static int calc_ttl(void)
 {
         if (!ctx.repo)
                 return ctx.cfg.cache_root_ttl;