Fix for jpeg to allow fuzz

Bug: None
Change-Id: I6eecef4f755ffb9e3eeee9f8ca7890b3445b14a5
Reviewed-on: https://chromium-review.googlesource.com/c/libyuv/libyuv/+/1884878Reviewed-by: Dale Curtis <dalecurtis@chromium.org>
Commit-Queue: Frank Barchard <fbarchard@chromium.org>

source/mjpeg_decoder.cc

@@ -417,7 +417,10 @@ void init_source(j_decompress_ptr cinfo) {
 boolean fill_input_buffer(j_decompress_ptr cinfo) {
   BufferVector* buf_vec = reinterpret_cast<BufferVector*>(cinfo->client_data);
   if (buf_vec->pos >= buf_vec->len) {
+    // Don't assert-fail when fuzzing.
+#ifndef FUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION
     assert(0 && "No more data");
+#endif
     // ERROR: No more data
     return FALSE;
   }