clk: at91: system: don't try to free_irq when there is no IRQ

In the error path of at91_clk_register_system(), sys->irq is freed
unconditionally but it may not exist or be request at all.

Signed-off-by: Alexandre Belloni <[e-mail]>
Acked-by: Boris Brezillon <[e-mail]>
Signed-off-by: Stephen Boyd <[e-mail]>

drivers/clk/at91/clk-system.c

···
 
 	clk = clk_register(NULL, &sys->hw);
 	if (IS_ERR(clk)) {
-		free_irq(sys->irq, sys);
+		if (irq)
+			free_irq(sys->irq, sys);
 		kfree(sys);
 	}