Do we allow chain more descriptors than vq size in the case of indirect?
According to the spec:
"
The device limits the number of descriptors in a list through a
transport-specific and/or device-specific value. If not limited,
the maximum number of descriptors in a list is the virt queue
size.
"
This looks possible, so the above is probably wrong if the max number of
chained descriptors is negotiated through a device specific way.
OK, I will remove this check, while it is necessary to have a limitation
for indirect descriptor anyway, otherwise it is possible to hit an overflow
since presumably u16 is used for most number/size in the spec.