When parsing information elements, check for the full length beforehand.

When parsing information elements, check for the full length beforehand.

When parsing information elements, first check to make sure we have the
element ID and length, and fetch the length; then check to make sure we
have the entire element, including the information.  Remove those checks
from the handlers for individual elements.

This squelches a Coverity warning (when we check to make sure the length
remaining in the packet is enough for the element ID; the element ID is
one byte, and the loop continues as long as the length is non-zero, so
that's always true in the loop), and simplifies some other code.

Also check for the right length for fixed-length elements while we're at
it.