qemu: command: make qemuBuildVirtioOptionsStr void
Now that qemuBuildVirtioOptionsStr can not fail anymore, remove its return value and make it void. Signed-off-by: NBjoern Walk <bwalk@linux.ibm.com> Reviewed-by: NMichal Privoznik <mprivozn@redhat.com> Reviewed-by: NDaniel Henrique Barboza <danielhb413@gmail.com>
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