qga: remove undefined behavior in ga_install_service()
We shouldn't snprintf() from a buffer to the same buffer. Signed-off-by: NLaszlo Ersek <lersek@redhat.com> Signed-off-by: NMichael Roth <mdroth@linux.vnet.ibm.com> (cherry picked from commit a880845f) Signed-off-by: NMichael Roth <mdroth@linux.vnet.ibm.com>
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