hmp: expr_unary(): check for overflow in strtoul()/strtoull()
It's not checked currently, so something like: (qemu) balloon -100000000000001111114334234 (qemu) Will just "work" (in this case the balloon command will get a random value). Fix it by checking if strtoul()/strtoull() overflowed. Signed-off-by: NLuiz Capitulino <lcapitulino@redhat.com> Reviewed-by: NEric Blake <eblake@redhat.com>
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