powerpc/mm: ptdump: 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>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20200209105901.1620958-4-gregkh@linuxfoundation.org

arch/powerpc/mm/ptdump/bats.c

@@ -164,10 +164,8 @@ static const struct file_operations bats_fops = {
 
 static int __init bats_init(void)
 {
-	struct dentry *debugfs_file;
-
-	debugfs_file = debugfs_create_file("block_address_translation", 0400,
-					   powerpc_debugfs_root, NULL, &bats_fops);
-	return debugfs_file ? 0 : -ENOMEM;
+	debugfs_create_file("block_address_translation", 0400,
+			    powerpc_debugfs_root, NULL, &bats_fops);
+	return 0;
 }
 device_initcall(bats_init);

arch/powerpc/mm/ptdump/hashpagetable.c

@@ -527,13 +527,10 @@ static const struct file_operations ptdump_fops = {
 
 static int ptdump_init(void)
 {
-	struct dentry *debugfs_file;
-
 	if (!radix_enabled()) {
 		populate_markers();
-		debugfs_file = debugfs_create_file("kernel_hash_pagetable",
-				0400, NULL, NULL, &ptdump_fops);
-		return debugfs_file ? 0 : -ENOMEM;
+		debugfs_create_file("kernel_hash_pagetable", 0400, NULL, NULL,
+				    &ptdump_fops);
 	}
 	return 0;
 }

arch/powerpc/mm/ptdump/ptdump.c

@@ -417,12 +417,10 @@ void ptdump_check_wx(void)
 
 static int ptdump_init(void)
 {
-	struct dentry *debugfs_file;
-
 	populate_markers();
 	build_pgtable_complete_mask();
-	debugfs_file = debugfs_create_file("kernel_page_tables", 0400, NULL,
-			NULL, &ptdump_fops);
-	return debugfs_file ? 0 : -ENOMEM;
+	debugfs_create_file("kernel_page_tables", 0400, NULL, NULL,
+			    &ptdump_fops);
+	return 0;
 }
 device_initcall(ptdump_init);

arch/powerpc/mm/ptdump/segment_regs.c

@@ -55,10 +55,8 @@ static const struct file_operations sr_fops = {
 
 static int __init sr_init(void)
 {
-	struct dentry *debugfs_file;
-
-	debugfs_file = debugfs_create_file("segment_registers", 0400,
-					   powerpc_debugfs_root, NULL, &sr_fops);
-	return debugfs_file ? 0 : -ENOMEM;
+	debugfs_create_file("segment_registers", 0400, powerpc_debugfs_root,
+			    NULL, &sr_fops);
+	return 0;
 }
 device_initcall(sr_init);