updated for version 7.4.446

Problem:    In some situations, when setting up an environment to trigger an
            autocommand, the environment is not properly restored.
Solution:   Check the return value of switch_win() and call restore_win()
            always.  (Daniel Hahler)

src/misc2.c

@@ -1040,7 +1040,8 @@ free_all_mem()
     entered = TRUE;
 
 # ifdef FEAT_AUTOCMD
-    block_autocmds();	    /* don't want to trigger autocommands here */
+    /* Don't want to trigger autocommands from here on. */
+    block_autocmds();
 # endif
 
 # ifdef FEAT_WINDOWS