[ci skip] Remove trailing semicolon in gc.c

gc.c

@@ -8521,7 +8521,7 @@ gc_compact_move(rb_objspace_t *objspace, rb_heap_t *heap, rb_size_pool_t *size_p
 
         if (dheap->sweeping_page->free_slots > 0) {
             heap_add_freepage(dheap, dheap->sweeping_page);
-        };
+        }
 
         dheap->sweeping_page = ccan_list_next(&dheap->pages, dheap->sweeping_page, page_node);
         if (gc_compact_heap_cursors_met_p(dheap)) {