cleanup: resolve nlreturn linter issues

nlreturn linter requires a new line before return
and branch statements except when the return is alone
inside a statement group (such as an if statement) to
increase code clarity. This commit addresses such issues.

Updates: #1586

Signed-off-by: Rakshith R <rar@redhat.com>

internal/util/topology_test.go

@@ -235,6 +235,7 @@ func TestFindPoolAndTopology(t *testing.T) {
 				topologyPrefix+"/"+label1+l1Value1, topologyPrefix+"/"+label2+l2Value1,
 				poolName, topoSegment)
 		}
+
 		return nil
 	}
 	// Test nil values