packer/plugin: fix nil deref during ctrl-c of provisioner
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## 0.3.6 (unreleased)
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BUG FIXES:
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* core: Fix possible panic when ctrl-C during provisioner run.
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## 0.3.5 (August 28, 2013)
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@ -29,7 +29,7 @@ func (c *cmdProvisioner) Provision(ui packer.Ui, comm packer.Communicator) error
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}
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func (c *cmdProvisioner) checkExit(p interface{}, cb func()) {
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if c.client.Exited() {
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if c.client.Exited() && cb != nil {
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cb()
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} else if p != nil && !Killed {
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log.Panic(p)
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