include/linux/fs.h contains externs for a bunch of variables.  That obviously
belongs under ifdef __KERNEL__.
Signed-off-by: NJan Engelhardt <jengelh@medozas.de>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>