make get_file() return its argument

simplifies a bunch of callers...

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

diff --cc arch/ia64/kernel/perfmon.c
Simple merge

diff --cc drivers/tty/tty_io.c
Simple merge

diff --cc fs/autofs4/waitq.c
Simple merge

diff --cc fs/fuse/dev.c
Simple merge

diff --cc fs/nfsd/nfs4state.c
Simple merge

diff --cc fs/proc/base.c
Simple merge

diff --cc fs/select.c
Simple merge

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

diff --cc mm/fremap.c
Simple merge

diff --cc mm/mmap.c
Simple merge

diff --cc mm/nommu.c
Simple merge

diff --cc net/compat.c
Simple merge