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dav1d_fuzzer: skip empty frames to avoid assertions after 026069693ef

--- a/tests/libfuzzer/dav1d_fuzzer.c

+++ b/tests/libfuzzer/dav1d_fuzzer.c

@@ -90,6 +90,8 @@

         if (frame_size > size || ptr > data + size - frame_size)

             break;

+        if (!frame_size) continue;

+

         // copy frame data to a new buffer to catch reads past the end of input

         p = dav1d_data_create(&buf, frame_size);

         if (!p) goto cleanup;

@@ -110,7 +112,7 @@

             }

         } while (buf.sz > 0);

-        if (buf.sz > 0 || frame_size == 0)

+        if (buf.sz > 0)

             dav1d_data_unref(&buf);

     }