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virsh: Fix regression of vol-resize
Introduced by commit 1daa4ba33acf. vshCommandOptStringReq returns 0 on *success* or the option is not required && not present, both are right result. Error out when returning 0 is not correct. the caller, it doesn't have to check wether it (cherry picked from commit 2a3a725c33aba2046443d33eb473eb54517f61c8)
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@ -1075,7 +1075,7 @@ cmdVolResize(vshControl *ctl, const vshCmd *cmd)
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if (!(vol = vshCommandOptVol(ctl, cmd, "vol", "pool", NULL)))
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return false;
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if (vshCommandOptStringReq(ctl, cmd, "capacity", &capacityStr) <= 0)
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if (vshCommandOptStringReq(ctl, cmd, "capacity", &capacityStr) < 0)
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goto cleanup;
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virSkipSpaces(&capacityStr);
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if (*capacityStr == '-') {
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