Fix signedness of format string.

fSlice is a uint32_t.

Change-Id: I9a53bdbe0731611659630e59318b05434affdb2c
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/844438
Auto-Submit: John Stiles <johnstiles@google.com>
Commit-Queue: Michael Ludwig <michaelludwig@google.com>
Reviewed-by: Michael Ludwig <michaelludwig@google.com>
1 file changed