Bug #7243 calling prepare causing exception

Description:
Calling .Prepare on certain commands cause a problem

How to repeat:
Step to reproduce the problem:

1. Create the table and insert one record:

   create table twocolumns (one integer, two integer);
   insert into twocolumns values (1, 2);

2. Execute the following C# code:

   // Open the connection
   IDbConnection cnn = new MySqlConnection();
   cnn.ConnectionString = "Database=test;Data Source=DBSRVTEST;User Id=root;Password=123456";
   cnn.Open();
   // create the command and prepare the statement
   IDbCommand cmd = cnn.CreateCommand();
   cmd.CommandText = "SELECT * FROM twocolumns where one = ?p1";
   cmd.Prepare();
   // create the parameter
   IDbDataParameter p1 = cmd.CreateParameter();
   p1.ParameterName = "@p1";
   p1.DbType = DbType.Int32;
   p1.Precision = (byte)10;
   p1.Scale = (byte)0;
   p1.Size = 4;
   cmd.Parameters.Add(p1);
   p1.Value = 1;
   // Execute the reader
   IDataReader reader = cmd.ExecuteReader();
   // Fetch the first record
   reader.Read();
   // Close the connection
   cnn.Close();

3. Exception generated by the Prepare method:

   MySql.Data.MySqlClient.MySqlException: Expected end of data packet
      at MySql.Data.MySqlClient.NativeDriver.ReadEOF(Boolean readPacket)
      at MySql.Data.MySqlClient.NativeDriver.Prepare(String sql, String[] parmNames)
      at MySql.Data.MySqlClient.MySqlCommand.Prepare()
      at Test.Class1.Main(String[] args) in d:\test\class1.cs:line 39

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