switch simple cases of fget_light to fdget

arch/alpha/kernel/osf_sys.c

arch/ia64/kernel/perfmon.c

arch/parisc/hpux/fs.c

arch/powerpc/platforms/cell/spu_syscalls.c

drivers/infiniband/core/ucma.c

drivers/infiniband/core/uverbs_cmd.c

drivers/infiniband/core/uverbs_main.c

drivers/vfio/vfio.c

drivers/video/msm/mdp.c

fs/btrfs/ioctl.c

fs/coda/inode.c

fs/compat.c

fs/compat_ioctl.c

fs/eventpoll.c

fs/ext4/ioctl.c

fs/fcntl.c

fs/fhandle.c

fs/ioctl.c

fs/locks.c

fs/namei.c