ofz#6656 -1 isn't a good flag for all elements filled

Change-Id: I163de8fd943859fbf986da0928f3e3552d063a09
Reviewed-on: https://gerrit.libreoffice.org/50622Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>

xmloff/source/draw/XMLNumberStyles.cxx

@@ -603,11 +603,8 @@ SdXMLNumberFormatImportContext::~SdXMLNumberFormatImportContext()
 
 void SdXMLNumberFormatImportContext::add( OUString const & rNumberStyle, bool bLong, bool bTextual, bool bDecimal02, OUString const & rText )
 {
-    if( mnIndex == -1 || mnIndex == 16 )
-    {
-        mnIndex = -1;
+    if (mnIndex == 16)
         return;
-    }
 
     const SdXMLDataStyleNumber* pStyleMember = aSdXMLDataStyleNumbers;
     for( sal_uInt8 nIndex = 0; pStyleMember->meNumberStyle != XML_TOKEN_INVALID; nIndex++, pStyleMember++ )