For consistency with the shared header file (and to avoid confusion
with mbufs normally called *m in one place), rename the function
arguments to "mem".

This is a non-functional change.

Reviewed by:	gnn, eric.joyner intel.com
MFC after:	3 days


git-svn-id: svn+ssh://svn.freebsd.org/base/head@271745 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f