[6.0] ff86df680 minor vtim-ification

[Dridi Boukelmoune]

commit ff86df6808dbca2c449fdcdf88c5d1b838814e99
Author: Nils Goroll <nils.goroll at uplex.de>
Date:   Mon Nov 19 14:28:14 2018 +0100

    minor vtim-ification

diff --git a/lib/libvarnish/vnum.c b/lib/libvarnish/vnum.c
index 6caf931a1..b619199c6 100644
--- a/lib/libvarnish/vnum.c
+++ b/lib/libvarnish/vnum.c
@@ -110,11 +110,12 @@ VNUM(const char *p)
 
 /**********************************************************************/
 
-double
+vtim_dur
 VNUM_duration(const char *p)
 {
 	const char *t;
-	double r, sc = 1.0;
+	vtim_dur r;
+	double sc = 1.0;
 
 	if (p == NULL)
 		return (nan(""));