Fix 'potential memory leak' compiler warning.

This CL fixes the following compiler warning:

frameworks/av/media/libstagefright/SampleTable.cpp:569:9: warning:
 Memory allocated by 'new[]' should be deallocated by 'delete[]', not
 'delete'.

Bug: 33137046
Test: Compiled with change; no warning generated.

Change-Id: I29abd90e02bf482fa840d1f7206ebbdacf7dfa37
diff --git a/media/libstagefright/SampleTable.cpp b/media/libstagefright/SampleTable.cpp
index 5ce2b76..de5ea9c 100644
--- a/media/libstagefright/SampleTable.cpp
+++ b/media/libstagefright/SampleTable.cpp
@@ -566,7 +566,7 @@
 
     if (mDataSource->readAt(data_offset + 8, mSyncSamples,
             (size_t)allocSize) != (ssize_t)allocSize) {
-        delete mSyncSamples;
+        delete[] mSyncSamples;
         mSyncSamples = NULL;
         return ERROR_IO;
     }
@@ -992,4 +992,3 @@
 }
 
 }  // namespace android
-