[patch] stack.c, check return value of lookup_symbol

[msnyder@sonic.net]

>
> msnyder@sonic.net writes:
>> Since it's known that lookup_symbol can return NULL, my first impulse
>> was to call gdb_assert.  That still might be the right thing to do,
>> since it indicates some sort of internal fault -- but it seems to
>> me that it isn't necessarily fatal, and simply doing nothing is an
>> option...
>
> gdb_assert calls internal_error, so it's not going to sweep GDB out
> from under the user.  And the situation we're talking about here would
> be one where we found a symbol in a block, and then looked up that
> name in that block and didn't find the symbol.  I definitely want to
> see an internal error if that happens.

OK then -- how's this?

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