* insdel.c (CHECK_MARKERS): Redo to avoid gcc -Wempty-body diagnostic.

src/ChangeLog

@@ -2,6 +2,7 @@
 	* insdel.c (check_markers, make_gap_larger, make_gap_smaller):
 	(reset_var_on_error, Fcombine_after_change_execute_1): Now static.
+	(CHECK_MARKERS): Redo to avoid gcc -Wempty-body diagnostic.
 	* filelock.c (within_one_second): Now static.
 	(lock_file_1): Rename local to avoid shadowing.

src/insdel.c

@@ -70,9 +70,12 @@ Lisp_Object combine_after_change_buffer;
 Lisp_Object Qinhibit_modification_hooks;
 
 #define CHECK_MARKERS()				\
-  if (check_markers_debug_flag)			\
-    check_markers ();				\
-  else
+  do						\
+    {						\
+      if (check_markers_debug_flag)		\
+	check_markers ();			\
+    }						\
+  while (0)
 
 static void
 check_markers (void)