Fix memory leak in AAClipTest

We were not freeing the memory allocated by copyToMask in
one place.

Change-Id: I4404395e8bc2beb43eca5226e947c42b22805ef7
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/526076
Reviewed-by: Michael Ludwig <michaelludwig@google.com>
1 file changed