xen: Check return value of virStringReplace
After 6604a3dd in which new helper function has been introduced, the code calls virStringReplace and dereference the result immediately. The string function can, however, return NULL so this would SIGSEGV right away. Check for the return value of the string function. Signed-off-by: NMichal Privoznik <mprivozn@redhat.com>
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