[PATCH] logic error in async event-top/gdb_readline2

[msnyder@sonic.net]

OK, this function is the asynchronous version of top.c/gdb_readline
(of which it is also a copy).  The main difference is that wherever
the original (gdb_readline) returns a pointer to an input string,
this versino (gdb_readline2) passes the pointer to a callback called
'input_handler'.

And the problem is that the author neglected to make sure that
gdb_readline2 also returns after calling the callback.

As a result, we will enter code that was not ment to execute at
this time, and will access a pointer to memory that has already
been freed.

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