Unexpected device names

[Jason <jason@xxxxxxxxxxxx>]

Should partitions have their device name set? It's really unexpected to 
for the following incarnations of disklabel to give the following 
messages, except for the first:

disklabel da0
disklabel da0s4a
disklabel da0s4b
disklabel da0s4
disklabel da0s4c
disklabel da0s4d
. ..
disklabel da0s4p

WARNING: da0 si_iosize_max=0, using DFLTPHYS.
WARNING: #da/0x5000 si_iosize_max=0, using DFLTFPHYS.
WARNING: #da/0x5001 si_iosize_max=0, using DFLTFPHYS.
WARNING: #da/0x5002 si_iosize_max=0, using DFLTFPHYS.
WARNING: #da/0x5002 si_iosize_max=0, using DFLTFPHYS.
WARNING: #da/0x5003 si_iosize_max=0, using DFLTFPHYS.
. ..
WARNING: #da/0x50007 si_iosize_max=0, using DFLTFPHYS.

- Jason