Samle::mouse: fix wrong assert

Change-Id: Ifa17d524f4505514ed02716214e408fdda3ac3e8
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/227641
Reviewed-by: Hal Canary <halcanary@google.com>
Reviewed-by: Ben Wagner <bungeman@google.com>
Commit-Queue: Hal Canary <halcanary@google.com>
diff --git a/samplecode/Sample.cpp b/samplecode/Sample.cpp
index 69eb677..5a87c9e 100644
--- a/samplecode/Sample.cpp
+++ b/samplecode/Sample.cpp
@@ -96,7 +96,7 @@
                 fClick = nullptr;
                 return result;
             }
-            break;
+            return false;
     }
     SkASSERT(false);
     return false;