hostfs: No need to box and later unbox the file mode

There is really no point in having a function with 10
arguments.

Reported-by: Daniel Walter <d.walter@0x90.at>
Signed-off-by: Richard Weinberger <richard@nod.at>

diff --cc fs/hostfs/hostfs.h
Simple merge

diff --cc fs/hostfs/hostfs_kern.c
Simple merge

diff --cc fs/hostfs/hostfs_user.c
Simple merge