Eric Blake f49371ecae cutils: Allow NULL str in qemu_strtosz
All the other qemu_strto* and parse_uint allow a NULL str.  Having
qemu_strtosz not crash on qemu_strtosz(NULL, NULL, &value) is an easy
fix that adds some consistency between our string parsers.

Signed-off-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Hanna Czenczek <hreitz@redhat.com>
Message-Id: <20230522190441.64278-13-eblake@redhat.com>
2023-06-02 12:29:27 -05:00
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