NFSv4.2: Fix a reference leak in nfs42_proc_layoutstats_generic

The caller of rpc_run_task also gets a reference that must be put.

Signed-off-by: Jeff Layton <[e-mail]>
Cc: [e-mail] # 4.2+
Signed-off-by: Trond Myklebust <[e-mail]>
Signed-off-by: Anna Schumaker <[e-mail]>

fs/nfs/nfs42proc.c

···
 	task = rpc_run_task(&task_setup);
 	if (IS_ERR(task))
 		return PTR_ERR(task);
+	rpc_put_task(task);
 	return 0;
 }