duplicate output when dumping from ddb

[Navdeep Parhar]

"dump" or "call doadump" from within ddb display duplicate output.
This is with a serial console.  I have  console="comconsole,vidconsole"
in /boot/loader.conf and  "-D -S115200"  in /boot.config.

db> dump
Dumping 1883 out of 12255 MB:Dumping 1883 out of 12255
MB:..1%..1%..11%..11%..21%..21%..31%..31%..41%..41%..51%..51%..61%..61%..71%..71%..81%..81%..91%..91%

Dump complete
Dump complete
db>

Something seems to have changed in the last couple of months or so.

Regards,
Navdeep