Treat start(Incremental/Scanline)Decode errors as failures

Bug: oss-fuzz:11070

These may report kIncompleteInput or kErrorInInput, depending on
whether the data was truncated or had an error. In either case, if
we reach this error before decoding a row, the SkSampledCodec did not
decode anything, so report a hard failure.

Change-Id: Iabd459816f8f6760c4fb9f596c617d8399da90e6
Reviewed-on: https://skia-review.googlesource.com/c/165526
Commit-Queue: Leon Scroggins <scroggo@google.com>
Commit-Queue: Mike Klein <mtklein@google.com>
Auto-Submit: Leon Scroggins <scroggo@google.com>
Reviewed-by: Mike Klein <mtklein@google.com>
1 file changed