hmp: fix bad value conversion for M type
The M type converts from megabytes to bytes. However, the value can be negative before the conversion, which will lead to a flawed conversion. For example, this: (qemu) balloon -1000000000000011 (qemu) Just "works", but the value passed by the balloon command will be something else. This patch fixes this problem by requering a positive value before converting. There's really no reason to accept a negative value for the M type. Signed-off-by: NLuiz Capitulino <lcapitulino@redhat.com> Reviewed-by: NEric Blake <eblake@redhat.com>
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