Backport of "rtmp2: Use correct size of write macro for param2." into 1.18
requested to merge tpm/gst-plugins-bad:backport-mr-2146-into-1.18-fix_rtmp2_buffer_overflow into 1.18
Backport of !2146 (merged) "rtmp2: Use correct size of write macro for param2.".
Commits:
- 81d4ccdc rtmp2: Use correct size of write macro for param2.