nfs: ERR_PTR is expected on failure from nfs_do_clone_mount
nfs: ERR_PTR is expected on failure from nfs_do_clone_mount

Replace NULL with ERR_PTR(-EINVAL).

Signed-off-by: Denis V. Lunev <0e1ddfe761f44f291037b4efb98a5f5f36ee23b3@openvz.org>
Signed-off-by: Trond Myklebust <6a1f9db795c9fc44be97d66ab114c53193bd3d13@netapp.com>

KristFoundation/Programs,KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs