Remove unused code

Signed-off-by: Juraj Oravec <jurajoravec@mailo.com>

main.py

@@ -2,7 +2,6 @@
 
 import os
 import sys
-import math
 import argparse
 from dwex import formats
 from elftools.dwarf.locationlists import LocationParser, LocationExpr
@@ -195,8 +194,6 @@ class Bear():
         elif die_type.tag == 'DW_TAG_structure_type':
             load_children(die_type)
             child_dies = []
-            child_offset = 0
-            child_offset_bit = 0
             for child_die in die_type._children:
                 if child_die.tag != 'DW_TAG_member' and not configuration['all_members']:
                     continue