securid: v3: Add sanity check on serial number length
securid: v3: Add sanity check on serial number length

Short serial numbers can cause various other modules to malfunction and
may lead to bad memory accesses.  Ban them.

Signed-off-by: Kevin Cernekee <3105dbb3dd63fbb4f6371cfb04adc6726f76c56b@gmail.com>

cernekee/stoken,mtmiller/stoken,cernekee/stoken,cernekee/stoken,mtmiller/stoken,mtmiller/stoken,mtmiller/stoken,cernekee/stoken