libbinder_ndk: allow null codeToFunction.

If this is null (as in the fuzzer), it crashes.

Bug: N/A
Test: N/A
Change-Id: Icd0107d1fada88abad3375d619b672cae64190db

Author: Steven Moreland

libs/binder/ndk/include_cpp/android/binder_interface_utils.h

@@ -292,7 +292,10 @@ AIBinder_Class* ICInterface::defineClass(const char* interfaceDescriptor,
 #if !defined(__ANDROID_PRODUCT__) && \
         (defined(__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__) || __ANDROID_API__ >= 36)
     if API_LEVEL_AT_LEAST (36, 202504) {
-        AIBinder_Class_setTransactionCodeToFunctionNameMap(clazz, codeToFunction, functionCount);
+        if (codeToFunction != nullptr) {
+            AIBinder_Class_setTransactionCodeToFunctionNameMap(clazz, codeToFunction,
+                                                               functionCount);
+        }
     }
 #else
     (void)codeToFunction;