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If the driver is used in a non tdm mode priv->utdm is a NULL pointer.
Therefore we need to check this pointer first before checking si_regs.
Fixes: c19b6d246a ("drivers/net: support hdlc function for QE-UCC")
Signed-off-by: Holger Brunck <holger.brunck@hitachienergy.com>
Reviewed-by: Simon Horman <horms@kernel.org>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>