media: exynos4-is: Use global num_sensors rather than local index

Instead of keeping a local copy of how many sensors we've probed
(which may not even properly represent the number of sensors
probed if we have a port without a sensor), use the global
num_sensors counter that has the actual number used.

This will also make it easier to add support for multiple sensors
being connected to the same port.

Signed-off-by: Jonathan Bakker <[email protected]>
Reviewed-by: Sylwester Nawrocki <[email protected]>
Signed-off-by: Hans Verkuil <[email protected]>
Signed-off-by: Mauro Carvalho Chehab <[email protected]>

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