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Add sanity check to ivtvfb_pan_display() to ensure only valid values are used to pan the display. Invalid values are rejected with -EINVAL Signed-off-by: Ian Armstrong <ian@iarmst.demon.co.uk> Signed-off-by: Andy Walls <awalls@md.metrocast.net> Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>