Fix misc-macro-parentheses warnings.

Bug: 28705665
Change-Id: Ie514abfe12bea065658da3706aad8b4c9c0a93c7
diff --git a/modules/camera/ExampleCamera.cpp b/modules/camera/ExampleCamera.cpp
index d873321..2b1f185 100644
--- a/modules/camera/ExampleCamera.cpp
+++ b/modules/camera/ExampleCamera.cpp
@@ -26,7 +26,7 @@
 
 #include "ExampleCamera.h"
 
-#define ARRAY_SIZE(a) (sizeof(a) / sizeof(a[0]))
+#define ARRAY_SIZE(a) (sizeof(a) / sizeof((a)[0]))
 
 namespace default_camera_hal {