fix commit

fix my commit aa2f02a4
"remove operator>> and operator<< methods"

I incorrectly inverted the conditional

Change-Id: Iade05b88bdedb7e5b0cff25a80d3b88ff4a0235f

oox/source/helper/binaryinputstream.cxx

@@ -45,7 +45,7 @@ OUString BinaryInputStream::readNulUnicodeArray()
     for (;;)
     {
       sal_uInt16 nChar = readuInt16();
-      if ( mbEof || (nChar < 0) ) break;
+      if ( mbEof || (nChar == 0) ) break;
       aBuffer.append( static_cast< sal_Unicode >( nChar ) );
     }
     return aBuffer.makeStringAndClear();