While the function is exported via header, the symbol itself was not.

Signed-off-by: Peter Krempa <pkrempa@redhat.com>
---
 src/libvirt_private.syms | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/libvirt_private.syms b/src/libvirt_private.syms
index f0f7aa8654..653c84a520 100644
--- a/src/libvirt_private.syms
+++ b/src/libvirt_private.syms
@@ -796,6 +796,7 @@ virDomainDefPostParse;
 virDomainActualNetDefValidate;
 virDomainDefOSValidate;
 virDomainDefValidate;
+virDomainDeviceDefValidate;
 virDomainDeviceValidateAliasForHotplug;
 virDomainDiskDefSourceLUNValidate;
 virDomainDiskDefValidateStartupPolicy;
-- 
2.45.1