compat: fix compilation warning for compat_firmware_class on 2.6.26
This fixes this compilation issue:
CC [M] /home/mcgrof/compat/compat/compat_firmware_class.o
/home/mcgrof/compat/compat/compat_firmware_class.c:24:0: warning: "to_dev" redefined
include/linux/input.h:1218:0: note: this is the location of the previous definition
/home/mcgrof/compat/compat/compat_firmware_class.c:24:0: warning: "to_dev" redefined
include/linux/input.h:1218:0: note: this is the location of the previous definition
Signed-off-by: Luis R. Rodriguez <mcgrof@frijolero.org>