Merge kpdesk.mysql.com:/home/thek/dev/mysql-4.1-maint

into  kpdesk.mysql.com:/home/thek/dev/mysql-5.0-maint

mysys/mf_iocache.c

@@ -343,11 +343,7 @@ my_bool reinit_io_cache(IO_CACHE *info, enum cache_type type,
       if (info->type == READ_CACHE)
       {
 	info->write_end=info->write_buffer+info->buffer_length;
-        /*
-          Trigger a new seek only if we have a valid
-          file handle.
-        */
-        info->seek_not_done= (info->file >= 0);
+	info->seek_not_done=1;
       }
       info->end_of_file = ~(my_off_t) 0;
     }