staging/lustre: Unbreak ll_prep_inode iget result check

commit 020ecc6f ("staging: lustre: llite: Remove IS_ERR tests")
managed to break one of the converted checks by losing a dereference
causing the condition to be wrong and hence leading
to a crash later on in case of actual error.
IS_ERR_OR_NULL(*inode) got converted into !inode.
Signed-off-by: Oleg Drokin <green@linuxhacker.ru>
CC: Amitoj Kaur Chawla <amitoj1606@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/lustre/lustre/llite/llite_lib.c

@@ -1972,7 +1972,7 @@ int ll_prep_inode(struct inode **inode, struct ptlrpc_request *req,
 		*inode = ll_iget(sb, cl_fid_build_ino(&md.body->fid1,
 					     sbi->ll_flags & LL_SBI_32BIT_API),
 				 &md);
-		if (!inode) {
+		if (!*inode) {
 #ifdef CONFIG_FS_POSIX_ACL
 			if (md.posix_acl) {
 				posix_acl_release(md.posix_acl);