Found this while poking around - an extra newline in if_iwx.c.
Index: sys/dev/pci/if_iwx.c
===================================================================
RCS file: /cvs/src/sys/dev/pci/if_iwx.c,v
retrieving revision 1.69
diff -u -p -u -p -r1.69 if_iwx.c
--- sys/dev/pci/if_iwx.c 18 Jul 2021 13:07:13 -0000 1.69
+++ sys/dev/pci/if_iwx.c 20 Jul 2021 01:17:35 -0000
@@ -502,7 +502,6 @@ iwx_is_mimo_mcs(int mcs)
{
int ridx = iwx_mcs2ridx[mcs];
return iwx_is_mimo_ht_plcp(iwx_rates[ridx].ht_plcp);
-
}
int
