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In NintendoDataFetcher::GetGamepadData we call GetPadState to
get a pointer to an unused PadState slot. This pointer may be
null if there are no more unused slots (Chrome supports at most
four connected gamepads).

This CL adds a null check so we don't try to dereference the
null PadState and crash.

BUG=996052

Change-Id: I48cb1611b1c557e5eaa1a5791bf68d5acf8841ad
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1762603
Commit-Queue: Matt Reynolds <mattreynolds@chromium.org>
Reviewed-by: Ovidio de Jesús Ruiz-Henríquez <odejesush@chromium.org>
Cr-Commit-Position: refs/heads/master@{#689709}