can: peak_canfd: mark expected switch fall-through

In preparation to enabling -Wimplicit-fallthrough, mark switch cases where we are expecting to fall through.

Notice that, in this particular case, a spelling mistake is fixed.

Warning level 3 was used: -Wimplicit-fallthrough=3

This patch is part of the ongoing efforts to enabling -Wimplicit-fallthrough.

---
 drivers/net/can/peak_canfd/peak_pciefd_main.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

index c458d5fdc8d3..e4f4d65a76b4 100644
@@ -668,7 +668,7 @@ static int pciefd_can_probe(struct pciefd_board *pciefd)
 		pciefd_can_writereg(priv, CANFD_CLK_SEL_80MHZ,
 				    PCIEFD_REG_CAN_CLK_SEL);
 
-		/* fallthough */
+		/* fall through */
 	case CANFD_CLK_SEL_80MHZ:
 		priv->ucan.can.clock.freq = 80 * 1000 * 1000;
 		break;

2.20.1