Fix blur region drawing crashing

Introduced in ag/13439384.

Bug: 180708538
Test: Using SilkFX app
Change-Id: I4f1b7ad50d9cb1e3e48a307e553c05a799bb14f4
diff --git a/libs/renderengine/skia/SkiaGLRenderEngine.cpp b/libs/renderengine/skia/SkiaGLRenderEngine.cpp
index 55ec6ad..327b04c 100644
--- a/libs/renderengine/skia/SkiaGLRenderEngine.cpp
+++ b/libs/renderengine/skia/SkiaGLRenderEngine.cpp
@@ -753,7 +753,7 @@
                                             blurInput);
             }
             for (auto region : layer->blurRegions) {
-                if (cachedBlurs[region.blurRadius] != nullptr) {
+                if (cachedBlurs[region.blurRadius] == nullptr) {
                     ATRACE_NAME("BlurRegion");
                     cachedBlurs[region.blurRadius] =
                             mBlurFilter->generate(grContext.get(), region.blurRadius, blurInput,