only recheck fNeedsTiling if we computed fSrcBounds

Bug: oss-fuzz:7363
Change-Id: I64cc83d31e8aaf8221e78c3b5301ffcce45449c1
Reviewed-on: https://skia-review.googlesource.com/121795
Reviewed-by: Mike Reed <reed@google.com>
Commit-Queue: Mike Reed <reed@google.com>
1 file changed