staging: unisys: rename misleading var ii with frag

This patch removes misleading variable name with a more appropriate
name. Since ii is keeping track of fragments inside a for loop I
renamed it frag.
ii->frag

Signed-off-by: Erik Arfvidson <erik.arfvidson@unisys.com>
Signed-off-by: David Kershner <david.kershner@unisys.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>