get rid of fget_light()

instead of returning the flags by reference, we can just have the
low-level primitive return those in lower bits of unsigned long,
with struct file * derived from the rest.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

diff --cc fs/file.c
Simple merge

diff --cc fs/read_write.c
Simple merge

diff --cc include/linux/file.h
Simple merge

diff --cc include/linux/fs.h
Simple merge