Fix ImageFilter fuzzer issue

src/core/SkValidatingReadBuffer.cpp

Index: src/core/SkValidatingReadBuffer.cpp
diff --git a/src/core/SkValidatingReadBuffer.cpp b/src/core/SkValidatingReadBuffer.cpp
index 52006f23ad066391ee9731f942d737b54170c8b6..b85e532d0cf4de2a88fdeeb5751715859a46c229 100644
--- a/src/core/SkValidatingReadBuffer.cpp
+++ b/src/core/SkValidatingReadBuffer.cpp
@@ -145,6 +145,13 @@ void SkValidatingReadBuffer::readRect(SkRect* rect) {
     }
 }
 
+void SkValidatingReadBuffer::readRRect(SkRRect* rrect) {
+    const void* ptr = this->skip(sizeof(SkRRect));
+    if (!fError) {
+        memcpy(rrect, ptr, sizeof(SkRRect));
+    }
+}
+
 void SkValidatingReadBuffer::readRegion(SkRegion* region) {
     size_t size = 0;
     if (!fError) {