qemu_agent: Remove obvious comments
Most APIs in libvirt report errors, thus no need to state that explicitly.
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Most APIs in libvirt report errors, thus no need to state that explicitly.
mentioned in commit eb49d5c5
·mentioned in commit ca508e88
·mentioned in commit 42695c1c
·mentioned in commit b3dd1b2f
·mentioned in commit c07603e9
·mentioned in commit d9af0809
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