can: c_can: Fix berr reporting

can: c_can: Fix berr reporting

Reading the LEC type with

  return (mode & ENABLED) && (status & LEC_MASK);

is not guaranteed to return (status & LEC_MASK) if the enabled bit in
mode is set. It's guaranteed to return 0 or !=0.

Remove the inline function and call unconditionally into the
berr_handling code and return early when the reporting is disabled.

Signed-off-by: Thomas Gleixner <[email protected]>
Tested-by: Alexander Stein <[email protected]>
Signed-off-by: Marc Kleine-Budde <[email protected]>