fix error that ran no tests if no options were passed

git-svn-id: http://skia.googlecode.com/svn/trunk@8959 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/tests/skia_test.cpp b/tests/skia_test.cpp
index 1763e6b..238252d 100644
--- a/tests/skia_test.cpp
+++ b/tests/skia_test.cpp
@@ -185,7 +185,7 @@
 static bool shouldSkip(const char* testName) {
     int count = FLAGS_match.count();
     size_t testLen = strlen(testName);
-    bool anyExclude = false;
+    bool anyExclude = count == 0;
     for (int index = 0; index < count; ++index) {
         const char* matchName = FLAGS_match[index];
         size_t matchLen = strlen(matchName);