bplist: Fix missing break in switch statement in plist_to_bin()

Credit to Christophe Fergeau
diff --git a/src/bplist.c b/src/bplist.c
index fe80458..9acd6ae 100644
--- a/src/bplist.c
+++ b/src/bplist.c
@@ -1270,6 +1270,7 @@
             break;
         case PLIST_DATA:
             write_data(bplist_buff, data->buff, data->length);
+            break;
         case PLIST_ARRAY:
             write_array(bplist_buff, ptr_array_index(objects, i), ref_table, ref_size);
             break;