drm/nouveau/debugfs: Move a variable assignment behind a null pointer check in nouveau_debugfs_pstate_get()

The address of a data structure member was determined before
a corresponding null pointer check in the implementation of
the function “nouveau_debugfs_pstate_get”.

Thus avoid the risk for undefined behaviour by moving the assignment
for the variable “ctrl” behind the null pointer check.

This issue was detected by using the Coccinelle software.

Signed-off-by: Markus Elfring <[email protected]>
Reviewed-by: Karol Herbst <[email protected]>
Signed-off-by: Karol Herbst <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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