0.1.3 269 #fix wrong cast to generic rm_msg
0.1.3 269 #fix wrong cast to generic rm_msg

The pointer passed to rm_calc_msg_len(void *arg)
is a pointer to message header but is casted to rm_msg.
When it is dereferenced the value of header is treated
as a pointer to header and segmentation fault happens.
Fixed now.

spinlockirqsave/rsyncme,spinlockirqsave/rsyncme