Fix Licence Text && Fix while loop issue

Author: xrkolovos

itext.tests/itext.forms.tests/itext/forms/FlatteningWithNullKidElementTest.cs

@@ -16,7 +16,7 @@ OF THIRD PARTY RIGHTS
 or FITNESS FOR A PARTICULAR PURPOSE.
 See the GNU Affero General Public License for more details.
 You should have received a copy of the GNU Affero General Public License
-along with this program; if not, see http://www.gnu.org/licenses or write tod
+along with this program; if not, see http://www.gnu.org/licenses or write to
 the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
 Boston, MA, 02110-1301 USA, or download the license from the following URL:
 http://itextpdf.com/terms-of-use/

itext/itext.kernel/itext/kernel/pdf/filters/FlateDecodeFilter.cs

@@ -259,7 +259,7 @@ protected internal static byte[] FlateDecodeInternal(byte[] @in, bool strict, Me
             byte[] b = new byte[strict ? 4092 : 1];
             try {
                 int n;
-                while ((n = zip.Read(b)) >= 0) {
+                while ((n = zip.Read(b)) > 0) {
                     @out.Write(b, 0, n);
                 }
                 zip.Dispose();