can: rx-offload: can_rx_offload_offload_one(): increment rx_fifo_errors on queue...

can: rx-offload: can_rx_offload_offload_one(): increment rx_fifo_errors on queue overflow or OOM

BugLink: https://bugs.launchpad.net/bugs/1855787
[ Upstream commit 4e9016bee3bf0c24963097edace034ff205b565c ]

If the rx-offload skb_queue is full or the skb allocation fails (due to OOM),
the mailbox contents is discarded.

This patch adds the incrementing of the rx_fifo_errors statistics counter.

Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Kamal Mostafa <kamal@canonical.com>
Signed-off-by: Kleber Sacilotto de Souza <kleber.souza@canonical.com>