Check for valid stencil buffer in GrGLGpu::clearStencilClip

Bug: chromium:984747
Change-Id: Ic71786a4de31b8836a4d28863cfaa474ed77502e
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/267446
Reviewed-by: Robert Phillips <robertphillips@google.com>
Commit-Queue: Robert Phillips <robertphillips@google.com>
Auto-Submit: Brian Salomon <bsalomon@google.com>
1 file changed