OSS-Fuzz: Add fuzzer targets dobytes function (#1765)

Signed-off-by: Arthur Chan <arthur.chan@adalogics.com>

test/fuzzers/fuzz_dobytes.c

@@ -0,0 +1,25 @@
+#include <stdint.h>
+#include <janet.h>
+
+/* Disable leak sanitizer */
+int __lsan_is_turned_off(void) { return 1; }
+
+int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) {
+
+    /* init Janet */
+    janet_init();
+
+    /* fuzz the compile + bytecode VM path (parse, compile, run) in src/core/compile.c and src/core/vm.c */
+    JanetTable *env = janet_core_env(NULL);
+    JanetTryState tstate;
+    if (janet_try(&tstate) == JANET_SIGNAL_OK) {
+        Janet out;
+        janet_dobytes(env, data, (int32_t) size, "<fuzz>", &out);
+    }
+    janet_restore(&tstate);
+
+    /* cleanup Janet */
+    janet_deinit();
+
+    return 0;
+}