nodeinfo: report error when failure in nodeSetMemoryParameters

nodeSetMemoryParameters() will call nodeSetMemoryParameterValue()
to set parameters. But it just filter the return code '-2' as
failure. Indeed we should report error when rc is negative.

https://bugzilla.redhat.com/show_bug.cgi?id=1161541Signed-off-by: NJincheng Miao <jmiao@redhat.com>

src/nodeinfo.c

@@ -1374,8 +1374,7 @@ nodeSetMemoryParameters(virTypedParameterPtr params ATTRIBUTE_UNUSED,
     for (i = 0; i < nparams; i++) {
         rc = nodeSetMemoryParameterValue(&params[i]);
 
-        /* Out of memory */
-        if (rc == -2)
+        if (rc < 0)
             return -1;
     }