Reduce DUMP permission denial output to one line.

Bug: 23940813
Change-Id: I0060dbaff5cd0c3d028ac5cd7aba7da3f0371150
diff --git a/services/camera/libcameraservice/CameraService.cpp b/services/camera/libcameraservice/CameraService.cpp
index 7e33e0c..2aaefe9 100644
--- a/services/camera/libcameraservice/CameraService.cpp
+++ b/services/camera/libcameraservice/CameraService.cpp
@@ -2265,7 +2265,7 @@
 
     String8 result("Dump of the Camera Service:\n");
     if (checkCallingPermission(String16("android.permission.DUMP")) == false) {
-        result.appendFormat("Permission Denial: "
+        result = result.format("Permission Denial: "
                 "can't dump CameraService from pid=%d, uid=%d\n",
                 getCallingPid(),
                 getCallingUid());