coverity#1430069 silence Uninitialized scalar field

Change-Id: I54b2140d965fc9c7dddfdcbddd9602ede800c3f7
Reviewed-on: https://gerrit.libreoffice.org/51566Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>

writerfilter/source/ooxml/OOXMLPropertySet.cxx

@@ -582,12 +582,9 @@ string OOXMLHexValue::toString() const
   class OOXMLHexColorValue
 */
 OOXMLHexColorValue::OOXMLHexColorValue(const char * pValue)
+    : OOXMLHexValue(sal_uInt32(COL_AUTO))
 {
-    if (!strcmp(pValue, "auto"))
-    {
-        mnValue = sal_uInt32(COL_AUTO);
-    }
-    else
+    if (strcmp(pValue, "auto"))
     {
         mnValue = rtl_str_toUInt32(pValue, 16);
     }

writerfilter/source/ooxml/OOXMLPropertySet.hxx

@@ -213,7 +213,6 @@ class OOXMLHexValue : public OOXMLValue
 {
 protected:
     sal_uInt32 mnValue;
-    OOXMLHexValue() {}
 public:
     explicit OOXMLHexValue(sal_uInt32 nValue);
     explicit OOXMLHexValue(const char * pValue);