db: change the file searched for static functions

db: change the file searched for static functions

The deal is that say you are parsing foo.c and you call a static function
my_function(), then you would expect that function to be found in foo.c
as well.  But actually it could from an included filed.

In this situation get_filename() returns the name of the included file
and get_base_file() returns "foo.c".  We want to use get_base_file
throughout.

This description is not totally correct.  get_filename() returns the
base file if you pass the --info flag so the information in the database
is already what we want.  To hit this bug you would have to call an
included function from a second included function.

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