HID: logitech-hidpp: Simplify array length check

Use the compiler to force a 100-length array, rather than check the
length after the fact.

Signed-off-by: Bastien Nocera <hadess@hadess.net>
Link: https://lore.kernel.org/r/20230302105555.51417-1-hadess@hadess.net


Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>