chore: Fix dictionaryRandomAccess's issue for small file

When size of the given file is less than 1024 (DICTIONARY_BYTES), dict[] may contain garbage.
Therefore, test_decompress() fails with garbage dictionary.

This change set fixes the failure of test for dictionaryRandomAccess with TESTFILE_SMALL.

examples/dictionaryRandomAccess.c

@@ -251,7 +251,7 @@ int main(int argc, char* argv[])
         FILE* outFp = fopen(decFilename, "wb");
 
         printf("decompress : %s -> %s\n", lz4Filename, decFilename);
-        test_decompress(outFp, inpFp, dict, DICTIONARY_BYTES, offset, length);
+        test_decompress(outFp, inpFp, dict, dictSize, offset, length);
         printf("decompress : done\n");
 
         fclose(outFp);