Previously emitted a compiler warning "warning: bitwise comparison
always evaluates to false."

Looking at the OpenBSD driver (which is based on this code) it looks
like the VLAN flag should be set if either of thsee bits is.  In the
OpenBSD driver these are AQ_RXDESC_TYPE_VLAN and AQ_RXDESC_TYPE_VLAN2
rather than a magic number 0x60.