Fixed submit urb logic so hardware doesn't hang trying to transmit
signal data

Removed unneeded enable/disable detector commands in
redrat3_transmit_ir (the hardware does this anyway) and converted
arguments to unsigned as per 5588dc2bSigned-off-by: NAndrew Vincer <andrew@redrat.co.uk>
Cc: Jarod Wilson <jarod@redhat.com>
Signed-off-by: NMauro Carvalho Chehab <mchehab@redhat.com>