Remove superfluous SkReadBuffer validity checks

The pattern is to create the spurious object & delete it later

Change-Id: I435e2872127e02c241b5dd27cd965f3c7047a77a
Reviewed-on: https://skia-review.googlesource.com/98783
Reviewed-by: Brian Osman <brianosman@google.com>
Commit-Queue: Robert Phillips <robertphillips@google.com>
2 files changed