Remove redudant string conversions

In the review of ag/26174212, an unnecessary string conversion was
identified; this CL corrects that, plus two other instances in
the same function.

Bug: 314732730
Test: Presubmit
(cherry picked from https://googleplex-android-review.googlesource.com/q/commit:60e4fdfa0897b94c003ba3df3b39a16e10c886d1

)
Merged-In: Id2b620088e12266f041be864271493ffe7e1a3b1
Change-Id: Id2b620088e12266f041be864271493ffe7e1a3b1
Signed-off-by: Edward Liaw <edliaw@google.com>

cmds/hid/src/com/android/commands/hid/Event.java

@@ -121,9 +121,9 @@ public class Event {
 
     public String toString() {
         return "Event{id=" + mId
-            + ", command=" + String.valueOf(mCommand)
-            + ", name=" + String.valueOf(mName)
-            + ", uniq=" + String.valueOf(mUniq)
+            + ", command=" + mCommand
+            + ", name=" + mName
+            + ", uniq=" + mUniq
             + ", descriptor=" + Arrays.toString(mDescriptor)
             + ", vid=" + mVid
             + ", pid=" + mPid