In mbuf(9) API length is always integer. Thus, cast mbuf length constants to be integers.
In mbuf(9) API length is always integer. Thus, cast mbuf length
constants to be integers.

Reviewed by:	bde

jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase