mm: make page bitmap smaller and stop whining if a page was already free in clear_bit

src/mm/page_alloc.c

@@ -31,7 +31,7 @@ void clear_bit(uint32_t page_index) {
     }
 
     if (!is_page_in_use(page_index)) {
-        printf("clear_bit: warning, page #0x%X was already free.\n", page_index);
+        //printf("clear_bit: warning, page #0x%X was already free.\n", page_index);
         return;
     }