Fix reading 16 bit millisecond value

It had originally been read as 16 bit via >> in
d2000efb "#i106421#: move msfilter to filter",
then accidentally changed to be read as 32 bit via >> in
9830fd36 "date/time IDL datatypes incompatible
change" (and later changed to be read as 32 bit explicitly via ReadUInt32 with
15535e32 "convert SvStream::operator>> methods
to ReadXXX methods").

Change-Id: I5062e67a578d182a0df2726ab8d0bae465f154f3
Reviewed-on: https://gerrit.libreoffice.org/64604Reviewed-by: Lionel Elie Mamane <lionel@mamane.lu>
Tested-by: Jenkins

filter/source/msfilter/svdfppt.cxx

@@ -2704,6 +2704,7 @@ static void ImportComment10( SvxMSDffManager const & rMan, SvStream& rStCtrl, Sd
 
             case PPT_PST_CommentAtom10 :
             {
+                sal_uInt16 millisec = 0;
                 rStCtrl.ReadInt32( nIndex )
                        .ReadInt16( aDateTime.Year )
                        .ReadUInt16( aDateTime.Month )
@@ -2712,11 +2713,11 @@ static void ImportComment10( SvxMSDffManager const & rMan, SvStream& rStCtrl, Sd
                        .ReadUInt16( aDateTime.Hours )
                        .ReadUInt16( aDateTime.Minutes )
                        .ReadUInt16( aDateTime.Seconds )
-                       .ReadUInt32( aDateTime.NanoSeconds )
+                       .ReadUInt16( millisec )
                        .ReadInt32( nPosX )
                        .ReadInt32( nPosY );
 
-                aDateTime.NanoSeconds *= ::tools::Time::nanoPerMilli;
+                aDateTime.NanoSeconds = millisec * ::tools::Time::nanoPerMilli;
             }
             break;
         }