tests: virjson: Modify logic in testJSONFromString

To allow better testing in case where the string was parsed, modify the
logic so that the regular code path is not included in a conditional
block.

tests/virjsontest.c

@@ -27,24 +27,24 @@ testJSONFromString(const void *data)
 
     json = virJSONValueFromString(info->doc);
 
-    if (info->pass) {
-        if (!json) {
+    if (!json) {
+        if (info->pass) {
             VIR_TEST_VERBOSE("Fail to parse %s\n", info->doc);
-            ret = -1;
-            goto cleanup;
-        } else {
-            VIR_TEST_DEBUG("Parsed %s\n", info->doc);
-        }
-    } else {
-        if (json) {
-            VIR_TEST_VERBOSE("Should not have parsed %s\n", info->doc);
-            ret = -1;
             goto cleanup;
         } else {
             VIR_TEST_DEBUG("Fail to parse %s\n", info->doc);
+            ret = 0;
+            goto cleanup;
         }
     }
 
+    if (!info->pass) {
+        VIR_TEST_VERBOSE("Should not have parsed %s\n", info->doc);
+        goto cleanup;
+    }
+
+    VIR_TEST_DEBUG("Parsed %s\n", info->doc);
+
     ret = 0;
 
  cleanup: