generic_write_checks(): drop isblk argument

all remaining callers are passing 0; some just obscure that fact.

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

diff --cc fs/9p/vfs_file.c
Simple merge

diff --cc fs/btrfs/file.c
Simple merge

diff --cc fs/ceph/file.c
Simple merge

diff --cc fs/cifs/file.c
Simple merge

diff --cc fs/ext4/file.c
Simple merge

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

diff --cc fs/ncpfs/file.c
Simple merge

diff --cc fs/nfs/direct.c
Simple merge

diff --cc fs/ntfs/file.c
Simple merge

diff --cc fs/ocfs2/file.c
Simple merge

diff --cc fs/udf/file.c
Simple merge

diff --cc fs/xfs/xfs_file.c
Simple merge

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

diff --cc mm/filemap.c
Simple merge