Eliminating some valgrind warnings resulting from that some

storage engines do not set the unused null bits (i.e., the
filler bits and the X bit) correctly. Also adding some casts
to debug printouts to eliminate compiler warnings.

sql/records.cc

@@ -55,6 +55,7 @@ static int rr_index(READ_RECORD *info);
 void init_read_record_idx(READ_RECORD *info, THD *thd, TABLE *table,
                           bool print_error, uint idx)
 {
+  empty_record(table);
   bzero((char*) info,sizeof(*info));
   info->table= table;
   info->file=  table->file;
@@ -161,6 +162,7 @@ void init_read_record(READ_RECORD *info,THD *thd, TABLE *table,
   }
   else
   {
+    empty_record(table);
     info->record= table->record[0];
     info->ref_length= table->file->ref_length;
   }

sql/rpl_record.cc

@@ -105,7 +105,8 @@ pack_row(TABLE *table, MY_BITMAP const* cols,
         DBUG_PRINT("debug", ("field: %s; pack_ptr: 0x%lx;"
                              " pack_ptr':0x%lx; bytes: %d",
                              field->field_name, (ulong) old_pack_ptr,
-                             (ulong) pack_ptr, pack_ptr - old_pack_ptr));
+                             (ulong) pack_ptr,
+                             (int) (pack_ptr - old_pack_ptr)));
       }
 
       null_mask <<= 1;
@@ -239,7 +240,7 @@ unpack_row(Relay_log_info const *rli,
                              " pack_ptr: 0x%lx; pack_ptr': 0x%lx; bytes: %d",
                              f->field_name, metadata,
                              (ulong) old_pack_ptr, (ulong) pack_ptr,
-                             pack_ptr - old_pack_ptr));
+                             (int) (pack_ptr - old_pack_ptr)));
       }
 
       null_mask <<= 1;