Properly free bytes in SkDescriptor fuzzer

Bug: oss:19551
Change-Id: I154cb58790258261b067f9281e18b3e7403d1bd1
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/260821
Auto-Submit: Kevin Lubick <kjlubick@google.com>
Reviewed-by: Herb Derby <herb@google.com>
Commit-Queue: Kevin Lubick <kjlubick@google.com>
1 file changed