[xen] Use standard calling pattern for asprintf()
Our asprintf() implementation guarantees that strp will be NULL on allocation failure, but this is not standard behaviour. Detect errors by checking for a negative return value instead of a NULL pointer. Signed-off-by: Michael Brown <mcb30@ipxe.org>
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@ -538,8 +538,7 @@ void xenstore_dump ( struct xen_hypervisor *xen, const char *key ) {
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child += ( strlen ( child ) + 1 /* NUL */ ) ) {
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/* Construct child key */
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asprintf ( &child_key, "%s/%s", key, child );
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if ( ! child_key ) {
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if ( asprintf ( &child_key, "%s/%s", key, child ) < 0 ){
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DBGC ( xen, "XENSTORE could not allocate child "
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"key \"%s/%s\"\n", key, child );
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rc = -ENOMEM;
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