outmacho.c: macho_dbg_linenum - fix memory leak

If new list is not needed then we should free memory
allocated by nasm_basename and nasm_dirname calls.

CID 1432930

Signed-off-by: Cyrill Gorcunov <gorcunov@gmail.com>

output/outmacho.c

@@ -2139,6 +2139,9 @@ static void macho_dbg_linenum(const char *file_name, int32_t line_num, int32_t s
 
         if(need_new_list) {
             new_file_list(cur_file, cur_dir);
+        } else {
+            nasm_free((void *)cur_file);
+            nasm_free((void *)cur_dir);
         }
     }