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Some third-party controllers can't report firmware/hardware version.

Unlike for the DualSense, the driver does not use these values for
anything in the DualShock 4 case, but merely exposes them via sysfs.
They will simply be 0x0.
Signed-off-by: Max Staudt <max@enpas.org>
Signed-off-by: Jiri Kosina <jkosina@suse.com>