ras/debugfs: Fix error checking for debugfs_create_dir()

Check the return value of debugfs_create_dir() properly.

  [ bp: Rewrite commit message. ]

Signed-off-by: Osama Muhammad <osmtendev@gmail.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Link: https://lore.kernel.org/r/20230516182927.9171-1-osmtendev@gmail.com

Author: osmten

drivers/ras/debugfs.c

@@ -46,7 +46,7 @@ int __init ras_add_daemon_trace(void)
 
 	fentry = debugfs_create_file("daemon_active", S_IRUSR, ras_debugfs_dir,
 				     NULL, &trace_fops);
-	if (!fentry)
+	if (IS_ERR(fentry))
 		return -ENODEV;
 
 	return 0;