Add an assert for OSS-Fuzz debugging

Signed-off-by: Gavin D. Howard <gavin@gavinhoward.com>

src/dc_fuzzer.c

@@ -108,5 +108,7 @@ LLVMFuzzerTestOneInput(const uint8_t* Data, size_t Size)
 
 	free(bc_fuzzer_data);
 
+	assert(false);
+
 	return s == BC_STATUS_SUCCESS || s == BC_STATUS_QUIT ? 0 : -1;
 }