[Crash-utility] [PATCH] Fix compile warnings

[Bernhard Walle]

Hello,

patch attached. Please consider to add the changes mainline. But
please also check back all changes.

Some comments:

  gdb/dwarf2-frame.c:
    - I think the buf += overwrites the ++, at least my tests with
      some test codes showed that.
  
  tools.c:
    - this is really strange, if index = 0, then the assignment
      doesn't make sense. If it's random, it also doesn't make sense.  :)
      Didn't have time to dig into the whole logic of this hashtable.


Regards,
 Bernhard

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