transliteration: drop syllable chain when not needed

syllable.c

@@ -69,3 +69,14 @@ char *syllable_chain_to_string(struct syllable *head)
 
 	return buffer;
 }
+
+void syllable_chain_drop(struct syllable *head)
+{
+	struct syllable *walk = head, *next;
+
+	while (walk) {
+		next = walk->next;
+		syllable_drop(walk);
+		walk = next;
+	}
+}

syllable.h

@@ -17,5 +17,6 @@ struct syllable *syllable_append(struct syllable *tail, const char *data);
 
 unsigned int syllable_chain_length(struct syllable *head);
 char *syllable_chain_to_string(struct syllable *head);
+void syllable_chain_drop(struct syllable *head);
 
 #endif /* __SYLLABE_H */

transliteration.c

@@ -85,7 +85,10 @@ char *transliterate_devanagari_to_latin(const char *text,
 
 	apply_transliteration_filters(head, context->filters);
 
-	return syllable_chain_to_string(head);
+	tmp = syllable_chain_to_string(head);
+	syllable_chain_drop(head);
+
+	return tmp;
 }
 
 void transliteration_context_drop(struct transliteration_context *context)