Add OOM avoidance to SkFontDescriptor deserialization

Change-Id: I2bc6596701d9c2dd7058f9f1acceb8a9e672a409
Bug: oss-fuzz:52676
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/594799
Reviewed-by: Ben Wagner <bungeman@google.com>
1 file changed