Fix input event file finder
Fix input event file finder

Instead of concatenating the input device name with the prefix, we actually need
to concatenate the input event name with the prefix. Also make the prefix a C
array to allow correct sizeof() operations on it.

Signed-off-by: David Herrmann <fb53b2ddb8d141e0cb39d7c67c2f81b6bc2eb0f7@googlemail.com>

dvdhrm/xwiimote,AdamLuchjenbroers/xwiimote,barracks510/xwiimote,barracks510/xwiimote,barracks510/xwiimote,barracks510/xwiimote,AdamLuchjenbroers/xwiimote,dvdhrm/xwiimote