tools: virt-host-validate: fix missing translation marker

Fix a minor typo.
Signed-off-by: NBjoern Walk <bwalk@linux.vnet.ibm.com>

tools/virt-host-validate-qemu.c

@@ -31,7 +31,7 @@ int virHostValidateQEMU(void)
     virBitmapPtr flags;
     int ret = 0;
 
-    virHostMsgCheck("QEMU", "%s", ("for hardware virtualization"));
+    virHostMsgCheck("QEMU", "%s", _("for hardware virtualization"));
 
     flags = virHostValidateGetCPUFlags();