drm/gma500: fix a potential repeat execution in psb_driver_load

Instead of exiting the loop as expected when an entry is found, the
list_for_each_entry() continues until the traversal is complete. To
avoid potential executing 'ret = gma_backlight_init(dev);' repeatly,
goto outside the loop when found entry by replacing switch/case with
if statement.

Signed-off-by: Xiaomeng Tong <[email protected]>
Signed-off-by: Patrik Jakobsson <[email protected]>
[Fixed indentation]
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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