microblaze: 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.

Cc: Michal Simek <monstr@monstr.eu>
Cc: Rob Herring <robh@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Michal Simek <michal.simek@xilinx.com>

arch/microblaze/kernel/setup.c

@@ -192,23 +192,14 @@ struct dentry *of_debugfs_root;
 static int microblaze_debugfs_init(void)
 {
 	of_debugfs_root = debugfs_create_dir("microblaze", NULL);
-
-	return of_debugfs_root == NULL;
+	return 0;
 }
 arch_initcall(microblaze_debugfs_init);
 
 # ifdef CONFIG_MMU
 static int __init debugfs_tlb(void)
 {
-	struct dentry *d;
-
-	if (!of_debugfs_root)
-		return -ENODEV;
-
-	d = debugfs_create_u32("tlb_skip", S_IRUGO, of_debugfs_root, &tlb_skip);
-	if (!d)
-		return -ENOMEM;
-
+	debugfs_create_u32("tlb_skip", S_IRUGO, of_debugfs_root, &tlb_skip);
 	return 0;
 }
 device_initcall(debugfs_tlb);