Fix Sonar issue in sli/northbound module

One major issue
* move string literals to left side of
 string comparison

Issue-Id: CCSDK-87
Change-Id: Ibd1146a8a12dccc56fb620fe5830efb545ac39a1
Signed-off-by: surya-huawei <a.u.surya@huawei.com>
diff --git a/dataChange/provider/src/main/java/org/onap/ccsdk/sli/northbound/DataChangeProvider.java b/dataChange/provider/src/main/java/org/onap/ccsdk/sli/northbound/DataChangeProvider.java
index d47bcd1..0977fa0 100644
--- a/dataChange/provider/src/main/java/org/onap/ccsdk/sli/northbound/DataChangeProvider.java
+++ b/dataChange/provider/src/main/java/org/onap/ccsdk/sli/northbound/DataChangeProvider.java
@@ -148,7 +148,7 @@
 
 		String errorCode = serviceDataBuilder.getDataChangeResponseCode();
 
-		if ( errorCode != null && errorCode.length() != 0 && !( errorCode.equals("0")|| errorCode.equals("200"))) {
+		if (!("0".equals(errorCode) || "200".equals(errorCode))) {
 			LOG.error("Returned FAILED for "+SVC_OPERATION+" error code: '" + errorCode + "'");
 		} else {
 			LOG.info("Returned SUCCESS for "+SVC_OPERATION+" ");