skparagraph: fix leak

Change-Id: Ieb13a5430ac78ba3d310331c72a96f0323e67d6e
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/258811
Auto-Submit: Hal Canary <halcanary@google.com>
Commit-Queue: Ben Wagner <bungeman@google.com>
Reviewed-by: Ben Wagner <bungeman@google.com>
1 file changed