media: cadence: csi2rx: Fix csi2rx_start error handling

The clocks enabled by csi2rx_start function are intended to be disabled in
an error path but there are two issues:

1) the loop condition is always true and

2) the first clock disabled is the the one enabling of which failed.

Fix these two bugs by changing the loop condition as well as only disabling
the clocks that were actually enabled.

Reported-by: Mauro Chehab <[email protected]>
Signed-off-by: Sakari Ailus <[email protected]>
Acked-by: Maxime Ripard <[email protected]>
Signed-off-by: Mauro Carvalho Chehab <[email protected]>

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