can: pch_can: fix invalid error codes

Errors in CAN protocol (location) are reported in data[3] of the can
frame instead of data[2].

Cc: linux-stable <[e-mail]>
Signed-off-by: Olivier Sobrie <[e-mail]>
Signed-off-by: Marc Kleine-Budde <[e-mail]>

drivers/net/can/pch_can.c

···
 		stats->rx_errors++;
 		break;
 	case PCH_CRC_ERR:
-		cf->data[2] |= CAN_ERR_PROT_LOC_CRC_SEQ |
+		cf->data[3] |= CAN_ERR_PROT_LOC_CRC_SEQ |
 			       CAN_ERR_PROT_LOC_CRC_DEL;
 		priv->can.can_stats.bus_error++;
 		stats->rx_errors++;