This should fix the cppcheck warning "The unsigned expression
'sizeof(struct _PKT_INFO)' will never be negative so it is either
pointless or an error to check if it is."
wmem_safe_mult() was only used to do an overflow-safe multiplication of
a type size and a count of elements of that type; replace it with
wmem_safe_mult_type_size(), which takes the type as the first argument,
and checks only whether the count of elements is <= 0.
We have two format_size()s, with and without wmem scoped memory.
Move the wmem version to wsutil and add a convenience macro to
use g_malloc()ed memory.
This allows wmem to be used from other libraries, namely wsutil.
It is often the case that a funtion exists in wsutil and cannot
be used with a wmem scope, requiring some code duplication or
extra memory allocations, or vice-versa, code in epan cannot be
moved to wsutil because it has a wmem dependency.
To this end wmem is moved to wsutil. Scope management remains part
of epan because those scope semantics are specific to dissection.
Guy Harris