ntb: amd: Drop unnecessary error check for debugfs_create_dir

This patch removes the error checking for debugfs_create_dir in
ntb_hw_amd.c. This is because the DebugFS kernel API is developed
in a way that the caller can safely ignore the errors that
occur during the creation of DebugFS nodes. The debugfs APIs have
a IS_ERR() judge in start_creating() which can handle it
gracefully. so these checks are unnecessary.

Signed-off-by: Ruan Jinjie <ruanjinjie@huawei.com>
Acked-by: Sanjay R Mehta <sanju.mehta@amd.com>
Signed-off-by: Jon Mason <jdmason@kudzu.us>

Author: Ruan Jinjie

drivers/ntb/hw/amd/ntb_hw_amd.c

@@ -941,13 +941,10 @@ static void ndev_init_debugfs(struct amd_ntb_dev *ndev)
 		ndev->debugfs_dir =
 			debugfs_create_dir(pci_name(ndev->ntb.pdev),
 					   debugfs_dir);
-		if (IS_ERR(ndev->debugfs_dir))
-			ndev->debugfs_info = NULL;
-		else
-			ndev->debugfs_info =
-				debugfs_create_file("info", S_IRUSR,
-						    ndev->debugfs_dir, ndev,
-						    &amd_ntb_debugfs_info);
+		ndev->debugfs_info =
+			debugfs_create_file("info", S_IRUSR,
+					    ndev->debugfs_dir, ndev,
+					    &amd_ntb_debugfs_info);
 	}
 }