patch 8.2.3297: cannot use all commands inside a {} block

Problem:    Cannot use all commands inside a {} block after :command and
            :autocmd.
Solution:   Do consider \n to separate commands. (closes #8620)
diff --git a/src/evalvars.c b/src/evalvars.c
index dc747f7..721b688 100644
--- a/src/evalvars.c
+++ b/src/evalvars.c
@@ -812,7 +812,7 @@
 	    list_func_vars(&first);
 	    list_vim_vars(&first);
 	}
-	eap->nextcmd = check_nextcmd(arg);
+	set_nextcmd(eap, arg);
     }
     else if (expr[0] == '=' && expr[1] == '<' && expr[2] == '<')
     {
@@ -1629,7 +1629,7 @@
 	arg = skipwhite(name_end);
     } while (!ends_excmd2(name_end, arg));
 
-    eap->nextcmd = check_nextcmd(arg);
+    set_nextcmd(eap, arg);
 }
 
     static int