Avoid divide-by-zero

If the maximum dimension of a glyph is zero in the drawing of last
resort, then skip this SubRun.

Bug: oss-fuzz:48695
Bug: oss-fuzz:48690
Change-Id: Icdca979c4152494f7028a482e33224664d97f4ae
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/556597
Reviewed-by: Brian Osman <brianosman@google.com>
Commit-Queue: Herb Derby <herb@google.com>
1 file changed