GrGLGpu: Remove unused 'return'

We remove the last 'return' statement, which is never reached.
This makes it more clear at a glance what value is being
returned from the function.

Change-Id: Iedeb3f6783a45cb60cd4d1413e294fa025fd9651
Reviewed-on: https://skia-review.googlesource.com/c/191063
Reviewed-by: Mike Klein <mtklein@google.com>
Commit-Queue: Mike Klein <mtklein@google.com>
1 file changed