gdbstub: Do not use memset() on GByteArray

Introduce gdb_get_zeroes() to fill a GByteArray with zeroes.

Fixes: a010bdbe719 ("extend GByteArray to read register helpers")
Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Message-Id: <20200414102427.7459-1-philmd@redhat.com>
[AJB: used slightly more gliby set_size approach]
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Message-Id: <20200414200631.12799-13-alex.bennee@linaro.org>
3 files changed