Add comments for meaningless lines

Change-Id: I20ebe246f6980fd3054c2c7e98b5150eaabbcc77
diff --git a/native/jni/src/unigram_dictionary.cpp b/native/jni/src/unigram_dictionary.cpp
index cf806c1..6eaff48 100644
--- a/native/jni/src/unigram_dictionary.cpp
+++ b/native/jni/src/unigram_dictionary.cpp
@@ -225,7 +225,7 @@
             short unsigned int *w = outWords + j * MAX_WORD_LENGTH;
             char s[MAX_WORD_LENGTH];
             for (int i = 0; i <= MAX_WORD_LENGTH; i++) s[i] = w[i];
-            (void)s;
+            (void)s; // To suppress compiler warning
             AKLOGI("%s %i", s, frequencies[j]);
         }
     }