MIPS: Octeon: remove unnecessary null test before debugfs_remove_recursive

Fix checkpatch warning:
WARNING: debugfs_remove_recursive(NULL) is safe this check is probably not required

Signed-off-by: Fabian Frederick <fabf@skynet.be>
Acked-by: David Daney <david.daney@cavium.com>
Cc: linux-mips@linux-mips.org
Cc: linux-kernel@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/7224/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

arch/mips/cavium-octeon/oct_ilm.c

@@ -194,8 +194,7 @@ err_irq:
 static __exit void oct_ilm_module_exit(void)
 {
 	disable_timer(TIMER_NUM);
-	if (dir)
-		debugfs_remove_recursive(dir);
+	debugfs_remove_recursive(dir);
 	free_irq(OCTEON_IRQ_TIMER0 + TIMER_NUM, 0);
 }