infiniband: cxgb4: no need to check return value of debugfs_create functions

When calling debugfs functions, there is no need to ever check the
return value.  The function can work or not, but the code logic should
never do something different based on this.
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Acked-by: Steve Wise <swise@opengridcomputing.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>

drivers/infiniband/hw/cxgb4/device.c

@@ -720,11 +720,8 @@ static const struct file_operations ep_debugfs_fops = {
 	.read    = debugfs_read,
 };
 
-static int setup_debugfs(struct c4iw_dev *devp)
+static void setup_debugfs(struct c4iw_dev *devp)
 {
-	if (!devp->debugfs_root)
-		return -1;
-
 	debugfs_create_file_size("qps", S_IWUSR, devp->debugfs_root,
 				 (void *)devp, &qp_debugfs_fops, 4096);
 
@@ -740,7 +737,6 @@ static int setup_debugfs(struct c4iw_dev *devp)
 	if (c4iw_wr_log)
 		debugfs_create_file_size("wr_log", S_IWUSR, devp->debugfs_root,
 					 (void *)devp, &wr_log_debugfs_fops, 4096);
-	return 0;
 }
 
 void c4iw_release_dev_ucontext(struct c4iw_rdev *rdev,
@@ -1553,8 +1549,6 @@ static int __init c4iw_init_module(void)
 		return err;
 
 	c4iw_debugfs_root = debugfs_create_dir(DRV_NAME, NULL);
-	if (!c4iw_debugfs_root)
-		pr_warn("could not create debugfs entry, continuing\n");
 
 	reg_workq = create_singlethread_workqueue("Register_iWARP_device");
 	if (!reg_workq) {