Suppress null-pointer-arithmetic warning

Test: m checkbuild
Bug: 72331524
Change-Id: I592abac6402809d126ad83fe6a79551bf068e90c
diff --git a/Android.bp b/Android.bp
index 4abfa16..db39f62 100644
--- a/Android.bp
+++ b/Android.bp
@@ -9,6 +9,7 @@
         "-Wall",
         "-Werror",
         "-Wno-unused-variable",
+        "-Wno-null-pointer-arithmetic",
     ],
 
     export_include_dirs: [