Correctly handle misaligned VMIO buffer (whose start or end offset in the VM object are not page aligned). This should fix the mount_msdos panic after a failed attemp to mount as ffs.
Correctly handle misaligned VMIO buffer (whose start or end offset in the VM
object are not page aligned). This should fix the mount_msdos panic after a
failed attemp to mount as ffs.

Reviewed By:	Matthew Dillon	<dillon@apollo.backplane.com>
		Archie Cobbs	<archie@whistle.com>
		Dmitrij Tejblum <dima@tejblum.dnttm.rssi.ru>

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