update test/fuzztest/wantsenderstub_fuzzer/wantsenderstub_fuzzer.cpp.

Signed-off-by: liuyaoqian <liuyaoqian@huawei.com>

test/fuzztest/wantsenderstub_fuzzer/wantsenderstub_fuzzer.cpp

@@ -86,7 +86,7 @@ extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size)
         return 0;
     }
 
-    char* ch = (char*)malloc(size + 1);
+    char* ch = static_cast<char*>(malloc(size + 1));
     if (ch == nullptr) {
         std::cout << "malloc failed." << std::endl;
         return 0;