Always call va_end()

lib/libvarnish/vsb.c

@@ -355,11 +355,11 @@ VSB_vprintf(struct vsb *s, const char *fmt, va_list ap)
 		va_copy(ap_copy, ap);
 		len = vsnprintf(&s->s_buf[s->s_len], VSB_FREESPACE(s) + 1,
 		    fmt, ap_copy);
+		va_end(ap_copy);
 		if (len < 0) {
 			s->s_error = errno;
 			return (-1);
 		}
-		va_end(ap_copy);
 	} while (len > VSB_FREESPACE(s) &&
 	    VSB_extend(s, len - VSB_FREESPACE(s)) == 0);