staging: lustre: use ERR_CAST() function

use ERR_CAST() function instead of ERR_PTR() and PTR_ERR()
found using coccinelle and err_cast.cocci
Signed-off-by: Laurent Navet <laurent.navet@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/lustre/lustre/llite/llite_nfs.c

@@ -147,7 +147,7 @@ ll_iget_for_nfs(struct super_block *sb, struct lu_fid *fid, struct lu_fid *paren
 
 	inode = search_inode_for_lustre(sb, fid);
 	if (IS_ERR(inode))
-		RETURN(ERR_PTR(PTR_ERR(inode)));
+		RETURN(ERR_CAST(inode));
 
 	if (is_bad_inode(inode)) {
 		/* we didn't find the right inode.. */

drivers/staging/lustre/lustre/llite/rw.c

@@ -110,7 +110,7 @@ static struct ll_cl_context *ll_cl_init(struct file *file,
 
 	env = cl_env_get(&refcheck);
 	if (IS_ERR(env))
-		return ERR_PTR(PTR_ERR(env));
+		return ERR_CAST(env);
 
 	lcc = &vvp_env_info(env)->vti_io_ctx;
 	memset(lcc, 0, sizeof(*lcc));

drivers/staging/lustre/lustre/obdclass/local_storage.c

@@ -443,7 +443,7 @@ struct dt_object *local_file_find_or_create_with_fid(const struct lu_env *env,
 
 		ls = ls_device_get(dt);
 		if (IS_ERR(ls)) {
-			dto = ERR_PTR(PTR_ERR(ls));
+			dto = ERR_CAST(ls);
 		} else {
 			/* create the object */
 			dti->dti_attr.la_valid	= LA_MODE;
@@ -537,7 +537,7 @@ local_index_find_or_create_with_fid(const struct lu_env *env,
 
 		ls = ls_device_get(dt);
 		if (IS_ERR(ls)) {
-			dto = ERR_PTR(PTR_ERR(ls));
+			dto = ERR_CAST(ls);
 		} else {
 			/* create the object */
 			dti->dti_attr.la_valid		= LA_MODE;