[libFuzzer] simplify a test, hopefully to fix the bot

llvm-svn: 334156
diff --git a/compiler-rt/test/fuzzer/NullDerefTest.cpp b/compiler-rt/test/fuzzer/NullDerefTest.cpp
index 1b44b68..48df0f5 100644
--- a/compiler-rt/test/fuzzer/NullDerefTest.cpp
+++ b/compiler-rt/test/fuzzer/NullDerefTest.cpp
@@ -5,7 +5,7 @@
 #include <cstddef>
 #include <cstdint>
 #include <cstdlib>
-#include <iostream>
+#include <cstdio>
 
 static volatile int Sink;
 static volatile int *Null = 0;
@@ -16,7 +16,7 @@
     if (Size > 1 && Data[1] == 'i') {
       Sink = 2;
       if (Size > 2 && Data[2] == '!') {
-        std::cout << "Found the target, dereferencing NULL\n";
+        printf("Found the target, dereferencing NULL\n");
         *Null = 1;
       }
     }