If virDomainChrSourceDefNew(xmlopt) fails, it will lead to free()ing
the uninitialized pointer bus. The fix for this is to initialize bus
with NULL.
Signed-off-by: NMarc Hartmayer <mhartmay@linux.vnet.ibm.com>
Reviewed-by: NBoris Fiuczynski <fiuczy@linux.vnet.ibm.com>
Reviewed-by: NBjoern Walk <bwalk@linux.vnet.ibm.com>