Fix input buffer access in buffer overflow examples to guarantee overflow. (#88)

diff --git a/examples/input_buffer_overflow_fuzz_test.cc b/examples/input_buffer_overflow_fuzz_test.cc
index f442f33..62a5ea8 100644
--- a/examples/input_buffer_overflow_fuzz_test.cc
+++ b/examples/input_buffer_overflow_fuzz_test.cc

@@ -18,7 +18,7 @@
 
 void TriggerBufferOverflow(const uint8_t *data, size_t size) {
   if (size >= 3 && data[0] == 'F' && data[1] == 'U' && data[2] == 'Z' &&
-      data[3] == 'Z') {
+      data[size] == 'Z') {
     fprintf(stderr, "BUFFER OVERFLOW!\n");
   }
 }

diff --git a/examples/new_buffer_overflow_fuzz_test.cc b/examples/new_buffer_overflow_fuzz_test.cc
index c702827..9be07f1 100644
--- a/examples/new_buffer_overflow_fuzz_test.cc
+++ b/examples/new_buffer_overflow_fuzz_test.cc

@@ -19,7 +19,7 @@
 
 void TriggerBufferOverflow(const uint8_t *data, size_t size) {
   if (size >= 3 && data[0] == 'F' && data[1] == 'U' && data[2] == 'Z' &&
-      data[3] == 'Z') {
+      data[size] == 'Z') {
     fprintf(stderr, "BUFFER OVERFLOW!\n");
   }
 }