vz: get additional error information from job correctly

First, make function logPrlEventErrorHelper be void and only
print information (if any) from an event.
Second, don't rewrite original error with any errors we get
during parsing event info.
Third, ignore PRL_ERR_NO_DATA at all.
Signed-off-by: NMaxim Nestratov <mnestratov@virtuozzo.com>

src/vz/vz_sdk.c

@@ -105,19 +105,12 @@ logPrlErrorHelper(PRL_RESULT err, const char *filename,
         }                                          \
     } while (0)
 
-static PRL_RESULT
+static void
 logPrlEventErrorHelper(PRL_HANDLE event, const char *filename,
                        const char *funcname, size_t linenr)
 {
-    PRL_RESULT ret, retCode;
     char *msg1 = NULL, *msg2 = NULL;
     PRL_UINT32 len = 0;
-    int err = -1;
-
-    if ((ret = PrlEvent_GetErrCode(event, &retCode))) {
-        logPrlError(ret);
-        return ret;
-    }
 
     PrlEvent_GetErrString(event, PRL_TRUE, PRL_FALSE, NULL, &len);
 
@@ -136,13 +129,9 @@ logPrlEventErrorHelper(PRL_HANDLE event, const char *filename,
     virReportErrorHelper(VIR_FROM_THIS, VIR_ERR_INTERNAL_ERROR,
                          filename, funcname, linenr,
                          _("%s %s"), msg1, msg2);
-    err = 0;
-
  cleanup:
     VIR_FREE(msg1);
     VIR_FREE(msg2);
-
-    return err;
 }
 
 static PRL_RESULT
@@ -152,12 +141,12 @@ getJobResultHelper(PRL_HANDLE job, unsigned int timeout, PRL_HANDLE *result,
 {
     PRL_RESULT ret, retCode;
 
-    if ((ret = PrlJob_Wait(job, timeout))) {
+    if (PRL_FAILED(ret = PrlJob_Wait(job, timeout))) {
         logPrlErrorHelper(ret, filename, funcname, linenr);
         goto cleanup;
     }
 
-    if ((ret = PrlJob_GetRetCode(job, &retCode))) {
+    if (PRL_FAILED(ret = PrlJob_GetRetCode(job, &retCode))) {
         logPrlErrorHelper(ret, filename, funcname, linenr);
         goto cleanup;
     }
@@ -165,17 +154,25 @@ getJobResultHelper(PRL_HANDLE job, unsigned int timeout, PRL_HANDLE *result,
     if (retCode) {
         PRL_HANDLE err_handle;
 
+        ret = retCode;
+
         /* Sometimes it's possible to get additional error info. */
-        if ((ret = PrlJob_GetError(job, &err_handle))) {
+        if (PRL_FAILED(retCode = PrlJob_GetError(job, &err_handle))) {
             logPrlErrorHelper(ret, filename, funcname, linenr);
             goto cleanup;
         }
 
-        if (logPrlEventErrorHelper(err_handle, filename, funcname, linenr))
-            logPrlErrorHelper(retCode, filename, funcname, linenr);
+        if (PRL_FAILED(retCode = PrlEvent_GetErrCode(err_handle, &retCode))) {
+            logPrlErrorHelper(ret, filename, funcname, linenr);
+            if (PRL_ERR_NO_DATA != retCode)
+                logPrlError(retCode);
+            PrlHandle_Free(err_handle);
+            goto cleanup;
+        }
+
+        logPrlEventErrorHelper(err_handle, filename, funcname, linenr);
 
         PrlHandle_Free(err_handle);
-        ret = retCode;
     } else {
         ret = PrlJob_GetResult(job, result);
         if (PRL_FAILED(ret)) {