conf: set postParseFailed even without ALLOW_POST_PARSE_FAIL

We allow the postParse callbacks to fail for some reasons (missing
emulator binary) when parsing the configs from /etc/libvirt.
In that case, def->postParseFailed is set to true and the post
parse callbacks are re-executed on domain startup.

However this bool was only set when virDomainDefPostParse was called
with the ALLOW_POST_PARSE_FAIL flag set. If the callback failed
again on domain startup, the bool would be reset and subsequent
startups would not attempt to reexecute the callback.
Signed-off-by: NJán Tomko <jtomko@redhat.com>

src/conf/domain_conf.c

@@ -5027,6 +5027,9 @@ virDomainDefPostParseCheckFailure(virDomainDefPtr def,
                                   unsigned int parseFlags,
                                   int ret)
 {
+    if (ret != 0)
+        def->postParseFailed = true;
+
     if (ret <= 0)
         return ret;
 
@@ -5034,7 +5037,6 @@ virDomainDefPostParseCheckFailure(virDomainDefPtr def,
         return -1;
 
     virResetLastError();
-    def->postParseFailed = true;
     return 0;
 }