Fix some Go Report Card warnings (googleforgames#162)

* fix misspell
* add err check and fix var shadowing
* fix crd package comment

examples/simple-udp/client/main.go

@@ -44,14 +44,20 @@ func main() {
 	if err != nil {
 		log.Fatalf("Could not connect: %v", err)
 	}
-	defer conn.Close()
+
+	defer func() {
+		err = conn.Close()
+		if err != nil {
+			log.Fatalf("Could not close connection: %v", err)
+		}
+	}()
 
 	go func() {
 		b := make([]byte, bufferSize)
 		for {
-			n, err := conn.Read(b)
-			if err != nil {
-				log.Fatalf("Could not read packet: %v", err)
+			n, errRead := conn.Read(b)
+			if errRead != nil {
+				log.Fatalf("Could not read packet: %v", errRead)
 			}
 			log.Printf("Received Packet: %s", b[:n])
 		}

pkg/util/crd/crd.go

@@ -12,8 +12,8 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-// package crd contains utilities for working with
-// CustomResourceDefinitions
+// Package crd contains utilities for working with
+// CustomResourceDefinitions.
 package crd
 
 import (