staging/lustre/clio: reorder initialization in cl_req_alloc()

In cl_req_alloc() ensure that the list heads crq_pages and crq_layers
have been initialized before passing the request to
cl_req_completion(). This fixes an oops in the error path.
Signed-off-by: John L. Hammond <john.hammond@intel.com>
Reviewed-on: http://review.whamcloud.com/11009
Intel-bug-id: https://jira.hpdd.intel.com/browse/LU-5290Reviewed-by: Bobi Jam <bobijam@gmail.com>
Reviewed-by: Jinshan Xiong <jinshan.xiong@intel.com>
Signed-off-by: Oleg Drokin <oleg.drokin@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/lustre/lustre/obdclass/cl_io.c

@@ -1452,12 +1452,13 @@ struct cl_req *cl_req_alloc(const struct lu_env *env, struct cl_page *page,
 	if (req != NULL) {
 		int result;
 
-		OBD_ALLOC(req->crq_o, nr_objects * sizeof(req->crq_o[0]));
-		if (req->crq_o != NULL) {
-			req->crq_nrobjs = nr_objects;
 		req->crq_type = crt;
 		INIT_LIST_HEAD(&req->crq_pages);
 		INIT_LIST_HEAD(&req->crq_layers);
+
+		OBD_ALLOC(req->crq_o, nr_objects * sizeof(req->crq_o[0]));
+		if (req->crq_o != NULL) {
+			req->crq_nrobjs = nr_objects;
 			result = cl_req_init(env, req, page);
 		} else
 			result = -ENOMEM;