event-test: Use goto cleanup instead of if else jungle

Like in the rest of our code we tend to prefer 'goto' and
'cleanup' over 'if else' code structure. Do the same here.

Signed-off-by: Michal Privoznik <mprivozn@redhat.com>

examples/object-events/event-test.c

@@ -616,6 +616,8 @@ static void stop(int sig)
 
 int main(int argc, char **argv)
 {
+    int ret = EXIT_FAILURE;
+    virConnectPtr dconn = NULL;
     int callback1ret = -1;
     int callback2ret = -1;
     int callback3ret = -1;
@@ -643,28 +645,27 @@ int main(int argc, char **argv)
 
     if (argc > 1 && STREQ(argv[1], "--help")) {
         usage(argv[0]);
-        return -1;
+        goto cleanup;
     }
 
     if (virInitialize() < 0) {
         fprintf(stderr, "Failed to initialize libvirt");
-        return -1;
+        goto cleanup;
     }
 
     if (virEventRegisterDefaultImpl() < 0) {
         virErrorPtr err = virGetLastError();
         fprintf(stderr, "Failed to register event implementation: %s\n",
                 err && err->message ? err->message: "Unknown error");
-        return -1;
+        goto cleanup;
     }
 
-    virConnectPtr dconn = NULL;
     dconn = virConnectOpenAuth(argc > 1 ? argv[1] : NULL,
                                virConnectAuthPtrDefault,
                                VIR_CONNECT_RO);
     if (!dconn) {
         printf("error opening\n");
-        return -1;
+        goto cleanup;
     }
 
     virConnectRegisterCloseCallback(dconn,
@@ -769,24 +770,26 @@ int main(int argc, char **argv)
                                                      VIR_DOMAIN_EVENT_CALLBACK(myDomainEventDeviceAddedCallback),
                                                      strdup("device added"), myFreeFunc);
 
-    if ((callback1ret != -1) &&
+    if ((callback1ret == -1) ||
-        (callback2ret != -1) &&
+        (callback2ret == -1) ||
-        (callback3ret != -1) &&
+        (callback3ret == -1) ||
-        (callback4ret != -1) &&
+        (callback4ret == -1) ||
-        (callback5ret != -1) &&
+        (callback5ret == -1) ||
-        (callback6ret != -1) &&
+        (callback6ret == -1) ||
-        (callback7ret != -1) &&
+        (callback7ret == -1) ||
-        (callback9ret != -1) &&
+        (callback9ret == -1) ||
-        (callback10ret != -1) &&
+        (callback10ret == -1) ||
-        (callback11ret != -1) &&
+        (callback11ret == -1) ||
-        (callback12ret != -1) &&
+        (callback12ret == -1) ||
-        (callback13ret != -1) &&
+        (callback13ret == -1) ||
-        (callback14ret != -1) &&
+        (callback14ret == -1) ||
-        (callback15ret != -1) &&
+        (callback15ret == -1) ||
-        (callback16ret != -1) &&
+        (callback16ret == -1) ||
-        (callback17ret != -1) &&
+        (callback17ret == -1) ||
-        (callback18ret != -1) &&
+        (callback18ret == -1) ||
-        (callback19ret != -1)) {
+        (callback19ret == -1))
+        goto cleanup;
+
     if (virConnectSetKeepAlive(dconn, 5, 3) < 0) {
         virErrorPtr err = virGetLastError();
         fprintf(stderr, "Failed to start keepalive protocol: %s\n",
@@ -824,14 +827,18 @@ int main(int argc, char **argv)
 
     if (callback8ret != -1)
         virConnectDomainEventDeregisterAny(dconn, callback8ret);
-    }
 
     virConnectUnregisterCloseCallback(dconn, connectClose);
+    ret = EXIT_SUCCESS;
 
+
+ cleanup:
+    if (dconn) {
         VIR_DEBUG("Closing connection");
-    if (dconn && virConnectClose(dconn) < 0)
+        if (virConnectClose(dconn) < 0)
             printf("error closing\n");
-
         printf("done\n");
-    return 0;
+    }
+
+    return ret;
 }