x86: pmc_atom: don%27t check for NULL twice

debugfs_remove_recursive() is NULL-aware, thus, we may safely remove the check
here. There is no need to assing NULL to variable since it will be not used
anywhere.
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Acked-by: Aubrey Li <aubrey.li@linux.intel.com>
Cc: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Cc: Kumar P. Mahesh <mahesh.kumar.p@intel.com>
Link: http://lkml.kernel.org/r/1421253575-22509-3-git-send-email-andriy.shevchenko@linux.intel.comSigned-off-by: Thomas Gleixner <tglx@linutronix.de>

arch/x86/kernel/pmc_atom.c

@@ -202,11 +202,7 @@ static const struct file_operations pmc_sleep_tmr_ops = {
 
 static void pmc_dbgfs_unregister(struct pmc_dev *pmc)
 {
-	if (!pmc->dbgfs_dir)
-		return;
-
 	debugfs_remove_recursive(pmc->dbgfs_dir);
-	pmc->dbgfs_dir = NULL;
 }
 
 static int pmc_dbgfs_register(struct pmc_dev *pmc, struct pci_dev *pdev)