can: m_can: Release irq on error in m_can_open

can: m_can: Release irq on error in m_can_open

It appears that the irq requested in m_can_open() may be leaked
if an error subsequently occurs: if m_can_start() fails.

Address this by calling free_irq in the unwind path for
such cases.

Flagged by Smatch.
Compile tested only.

Fixes: eaacfeaca7ad ("can: m_can: Call the RAM init directly from m_can_chip_config")
Acked-by: Marc Kleine-Budde <mkl@pengutronix.de>
Signed-off-by: Simon Horman <horms@kernel.org>
Link: https://lore.kernel.org/all/20240805-mcan-irq-v2-1-7154c0484819@kernel.org
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>