fs/locks: fix fcntl_getlk64/fcntl_setlk64 stub prototypes

My patch to rework oabi fcntl64() introduced a harmless
sparse warning when file locking is disabled:

   arch/arm/kernel/sys_oabi-compat.c:251:51: sparse: sparse: incorrect type in argument 3 (different address spaces) @@     expected struct flock64 [noderef] __user *user @@     got struct flock64 * @@
   arch/arm/kernel/sys_oabi-compat.c:251:51: sparse:     expected struct flock64 [noderef] __user *user
   arch/arm/kernel/sys_oabi-compat.c:251:51: sparse:     got struct flock64 *
   arch/arm/kernel/sys_oabi-compat.c:265:55: sparse: sparse: incorrect type in argument 4 (different address spaces) @@     expected struct flock64 [noderef] __user *user @@     got struct flock64 * @@
   arch/arm/kernel/sys_oabi-compat.c:265:55: sparse:     expected struct flock64 [noderef] __user *user
   arch/arm/kernel/sys_oabi-compat.c:265:55: sparse:     got struct flock64 *

When file locking is enabled, everything works correctly and the
right data gets passed, but the stub declarations in linux/fs.h
did not get modified when the calling conventions changed in an
earlier patch.

Reported-by: kernel test robot <lkp@intel.com>
Fixes: 7e2d8c29 ("ARM: 9111/1: oabi-compat: rework fcntl64() emulation")
Fixes: a75d30c7

 ("fs/locks: pass kernel struct flock to fcntl_getlk/setlk")
Cc: Christoph Hellwig <hch@lst.de>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Acked-by: Christian Brauner <christian.brauner@ubuntu.com>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>