Refactoring: reused one Get method in the another in Int32Type

Author: wilbit

src/NHibernate/Type/Int32Type.cs

@@ -47,18 +47,7 @@ public override object Get(DbDataReader rs, int index, ISessionImplementor sessi
 
 		public override object Get(DbDataReader rs, string name, ISessionImplementor session)
 		{
-			try
-			{
-				return rs[name] switch
-				{
-					BigInteger bi => (int) bi,
-					var c => Convert.ToInt32(c)
-				};
-			}
-			catch (Exception ex)
-			{
-				throw new FormatException(string.Format("Input string '{0}' was not in the correct format.", rs[name]), ex);
-			}
+			return Get(rs, rs.GetOrdinal(name), session);
 		}
 
 		public override System.Type ReturnedClass