untracked_param: add a call back for when we lose track of a parameter

untracked_param: add a call back for when we lose track of a parameter

I want to create an "using uninitialized memory" warning.

The problem is:
1)  Maybe the function has too many return states so we drop everything.
This is especially if we're calling a function pointer which is implemented
many times.

2) Smatch is bad at tracking va_args.

3) Maybe the parameter is assigned to another variable and that variable is
set but we lose track of it.  This can also happen in assembly.

Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>