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: NAlexandre Belloni <alexandre.belloni@free-electrons.com>
Acked-by: NBoris Brezillon <boris.brezillon@free-electrons.com>
Signed-off-by: NStephen Boyd <sboyd@codeaurora.org>