WriterTest: Fix bounds check

Because of 0-based indexing, we need to make sure the index is
not equal to the number of elements in the array.

Test: TreeHugger
Change-Id: I9662d4a67cdfebb0c890c65a35a2456cd3af001b

media/libstagefright/tests/writer/WriterTest.cpp

@@ -234,7 +234,7 @@ int32_t WriterTest::addWriterSource(bool isAudio, configFormat params) {
 
 void getFileDetails(string &inputFilePath, string &info, configFormat &params, bool &isAudio,
                     int32_t streamIndex = 0) {
-    if (streamIndex > sizeof(kInputData) / sizeof(kInputData[0])) {
+    if (streamIndex >= sizeof(kInputData) / sizeof(kInputData[0])) {
         return;
     }
     inputFilePath += kInputData[streamIndex].inputFile;