can: m_can: m_can_handle_lec_err(): fix {rx,tx}_errors statistics

can: m_can: m_can_handle_lec_err(): fix {rx,tx}_errors statistics

The m_can_handle_lec_err() function was incorrectly incrementing only the
receive error counter, even in cases of bit or acknowledgment errors that
occur during transmission.

Fix the issue by incrementing the appropriate counter based on the
type of error.

Fixes: e0d1f4816f2a ("can: m_can: add Bosch M_CAN controller support")
Signed-off-by: Dario Binacchi <dario.binacchi@amarulasolutions.com>
Link: https://patch.msgid.link/20241122221650.633981-7-dario.binacchi@amarulasolutions.com
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>