resctrl: get rid of pointless debugfs_file_{get,put}()

JIRA: https://issues.redhat.com/browse/RHEL-118965

commit 460e36e
Author: Al Viro <viro@zeniv.linux.org.uk>
Date:   Wed Jul 2 22:16:50 2025 +0100

    resctrl: get rid of pointless debugfs_file_{get,put}()

    ->write() of file_operations that gets used only via debugfs_create_file()
    is called only under debugfs_file_get()

    Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
    Acked-by: Reinette Chatre <reinette.chatre@intel.com>
    Link: https://lore.kernel.org/r/20250702211650.GD3406663@ZenIV
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Signed-off-by: David Arcari <darcari@redhat.com>

Author: darcari

fs/resctrl/pseudo_lock.c

@@ -764,13 +764,9 @@ static ssize_t pseudo_lock_measure_trigger(struct file *file,
 	if (ret == 0) {
 		if (sel != 1 && sel != 2 && sel != 3)
 			return -EINVAL;
-		ret = debugfs_file_get(file->f_path.dentry);
-		if (ret)
-			return ret;
 		ret = pseudo_lock_measure_cycles(rdtgrp, sel);
 		if (ret == 0)
 			ret = count;
-		debugfs_file_put(file->f_path.dentry);
 	}
 
 	return ret;