Replace spec_bmap() with vop_panic:  We should never BMAP a device backed vnode only filesystem backed vnodes.
Replace spec_bmap() with vop_panic:  We should never BMAP a device backed
vnode only filesystem backed vnodes.

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