[libxslt] Avoid double/long round trip in FORMAT_ITEM

[Nick Wellnhofer <nwellnhof src gnome org>]

commit bf43ea2de184b2947dc1a256abb8cbf7edea8cda
Author: Nick Wellnhofer <wellnhofer aevum de>
Date:   Thu May 18 17:27:54 2017 +0200

    Avoid double/long round trip in FORMAT_ITEM

 libexslt/date.c |   14 ++++++--------
 1 files changed, 6 insertions(+), 8 deletions(-)
---
diff --git a/libexslt/date.c b/libexslt/date.c
index dd75a44..8687802 100644
--- a/libexslt/date.c
+++ b/libexslt/date.c
@@ -1171,14 +1171,12 @@ error:
  * @item:       char designator
  *
  */
-#define FORMAT_ITEM(num, cur, limit, item)                      \
-        if (num != 0) {                                         \
-            long comp = (long)num / limit;                      \
-            if (comp != 0) {                                    \
-                FORMAT_FLOAT((double)comp, cur, 0);             \
-                *cur++ = item;                                  \
-                num -= (double)(comp * limit);                  \
-            }                                                   \
+#define FORMAT_ITEM(num, cur, limit, item)                     \
+        if (num >= limit) {                                    \
+            double comp = floor(num / limit);                  \
+            FORMAT_FLOAT(comp, cur, 0);                                \
+            *cur++ = item;                                     \
+            num -= comp * limit;                               \
         }
 
 /**