[Crash-utility] [PATCH] Fix compile warnings

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