[libxslt] Always initialize EXSLT month and day to 1

[Nick Wellnhofer <nwellnhof src gnome org>]

commit 3309feb654036280d2355f8025150a69bfded6e2
Author: Nick Wellnhofer <wellnhofer aevum de>
Date:   Sun Jan 3 16:45:24 2016 +0100

    Always initialize EXSLT month and day to 1
    
    Fixes bug #757970
    https://bugzilla.gnome.org/show_bug.cgi?id=757970

 libexslt/date.c |   17 +++++++----------
 1 files changed, 7 insertions(+), 10 deletions(-)
---
diff --git a/libexslt/date.c b/libexslt/date.c
index 9ca993c..272c61b 100644
--- a/libexslt/date.c
+++ b/libexslt/date.c
@@ -667,6 +667,11 @@ exsltDateCreateDate (exsltDateType type)
     }
     memset (ret, 0, sizeof(exsltDateVal));
 
+    if (type != XS_DURATION) {
+        ret->value.date.mon = 1;
+        ret->value.date.day = 1;
+    }
+
     if (type != EXSLT_UNKNOWN)
         ret->type = type;
 
@@ -1395,10 +1400,10 @@ _exsltDateTruncateDate (exsltDateValPtr dt, exsltDateType type)
     }
 
     if ((type & XS_GDAY) != XS_GDAY)
-        dt->value.date.day = 0;
+        dt->value.date.day = 1;
 
     if ((type & XS_GMONTH) != XS_GMONTH)
-        dt->value.date.mon = 0;
+        dt->value.date.mon = 1;
 
     if ((type & XS_GYEAR) != XS_GYEAR)
         dt->value.date.year = 0;
@@ -1473,18 +1478,10 @@ _exsltDateAdd (exsltDateValPtr dt, exsltDateValPtr dur)
     d = &(dt->value.date);
     u = &(dur->value.dur);
 
-    /* normalization */
-    if (d->mon == 0)
-        d->mon = 1;
-
     /* normalize for time zone offset */
     u->sec -= (d->tzo * 60);   /* changed from + to - (bug 153000) */
     d->tzo = 0;
 
-    /* normalization */
-    if (d->day == 0)
-        d->day = 1;
-
     /* month */
     carry  = d->mon + u->mon;
     r->mon = (unsigned int)MODULO_RANGE(carry, 1, 13);