[CODE] ioctl_ works perfectly write and read, but not ioctl yet

ioctl fails in the switch. Possible reasons:
	- should I use same #include ioctl.h in user and kernel?
	- is it a problem of wrong major/minor?
	READ Documentation/ioctl/ioctl-number.txt
	- fix the warning on ioctl that I get when compiling kernel


Signed-off-by: Francesco Robino <frobino@kth.se>