ice: Use IfAPI accessor in place of if_capenable reference

[jhibbits]

Summary

8923de5905 (Update ice to 1.37.7-k) moved to using the ifnet's
capenable instead of one in its own softc in one location. Use the
IfAPI accessor instead.

[jhibbits]

@erj was the original change to this intended? Before the change it was:

if ((scctx->isc_capenable & IFCAP_RXCSUM) != 0)

From the rest of the file it looks unintended, but I can't tell.

[erj]

In D38929#886387, @jhibbits wrote:

@erj was the original change to this intended? Before the change it was:

if ((scctx->isc_capenable & IFCAP_RXCSUM) != 0)

From the rest of the file it looks unintended, but I can't tell.

Yeah, I think that change was unintentional.

[erj]

This comment was removed by erj.

[jhibbits]

@erj can you fix this the right way given what you also wrote in your now deleted comment? I could just revert the original change to the line if that's all that's needed.

[erj]

In D38929#893145, @jhibbits wrote:

@erj can you fix this the right way given what you also wrote in your now deleted comment? I could just revert the original change to the line if that's all that's needed.

I just reverted the change; we don't need to do something different with it just yet.

[jhibbits]

In D38929#893449, @erj wrote:

I just reverted the change; we don't need to do something different with it just yet.

Thanks! I'll abandon this now.