Since 4e3bdf72 there is no reason any
more to treat the seekable and non-seekable cases separate with regards
to the log message for a new cluster. This effectively reverts
d41aeea8.

Also improved the log message: "pts 80dts 0" -> "pts 80, dts 0".
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
Signed-off-by: James Almer <jamrial@gmail.com>