Fix build for GCC. Cast enum to int when using with %d format specifier

TBR: robertphillips@google.com

No-Tree-Checks: true
No-Try: true

Change-Id: Ib283021da485ebc2d271bd9673f1a7f739065189
Bug: skia:8962
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/213240
Reviewed-by: Robert Phillips <robertphillips@google.com>
Reviewed-by: Brian Salomon <bsalomon@google.com>
Commit-Queue: Brian Salomon <bsalomon@google.com>
1 file changed