Check file name valid or not.

Change-Id: Ia122050cabf68671c27e8aef3c69ec038c790899
Reviewed-on: https://skia-review.googlesource.com/130461
Commit-Queue: Ben Wagner <bungeman@google.com>
Commit-Queue: Bruce Wang <brucewang@google.com>
Reviewed-by: Ben Wagner <bungeman@google.com>

tests/CodecPartialTest.cpp

@@ -439,7 +439,7 @@ DEF_TEST(Codec_incomplete, r) {
                               "images/mandrill.wbmp",
                               }) {
         sk_sp<SkData> file = GetResourceAsData(name);
-        if (!name) {
+        if (!file) {
             continue;
         }