media: atomisp: compat32: use get_user() before referencing user data

The logic at get_atomisp_parameters32() is broken, as pointed by
smatch:

	drivers/staging/media/atomisp/pci/atomisp2/atomisp_compat_ioctl32.c:737:21: warning: dereference of noderef expression
	drivers/staging/media/atomisp/pci/atomisp2/atomisp_compat_ioctl32.c:744:60: warning: dereference of noderef expression
	drivers/staging/media/atomisp/pci/atomisp2/atomisp_compat_ioctl32.c:763:21: warning: dereference of noderef expression
	drivers/staging/media/atomisp/pci/atomisp2/atomisp_compat_ioctl32.c:770:60: warning: dereference of noderef expression
	drivers/staging/media/atomisp/pci/atomisp2/atomisp_compat_ioctl32.c:788:21: warning: dereference of noderef expression
	drivers/staging/media/atomisp/pci/atomisp2/atomisp_compat_ioctl32.c:795:60: warning: dereference of noderef expression
	drivers/staging/media/atomisp/pci/atomisp2/atomisp_compat_ioctl32.c:812:21: warning: dereference of noderef expression
	drivers/staging/media/atomisp/pci/atomisp2/atomisp_compat_ioctl32.c:819:60: warning: dereference of noderef expression

It tries to access userspace data directly, without calling
get_user(). That should generate OOPS. Thankfully, the right
logic is already there (although commented out).

Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>