dump-guest-memory.py: fix python 2 support
Python GDB support may use Python 2 or 3. Inferior.read_memory() may return a 'buffer' with Python 2 or a 'memoryview' with Python 3 (see also https://sourceware.org/gdb/onlinedocs/gdb/Inferiors-In-Python.html) The elf.add_vmcoreinfo_note() method expects a "bytes" object. Wrap the returned memory with bytes(), which works with both 'memoryview' and 'buffer'. Fixes a regression introduced with commit d23bfa91 ("add vmcoreinfo"). Suggested-by: NPeter Maydell <peter.maydell@linaro.org> Signed-off-by: NMarc-André Lureau <marcandre.lureau@redhat.com> Acked-by: NLaszlo Ersek <lersek@redhat.com> Reviewed-by: NEric Blake <eblake@redhat.com>
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