New function null_stream
This patch adds a new function null_stream, which returns a null
stream. The null stream can be used in multiple places. It is
used in gdb_insn_length, and the following patches will use it too.
gdb:
2017-01-26 Yao Qi <yao.qi@linaro.org>
* disasm.c (do_ui_file_delete): Delete.
(gdb_insn_length): Move code creating stream to ...
* utils.c (null_stream): ... here. New function.
* utils.h (null_stream): Declare.
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