Don't show non-positive shortcut keys in help_init()

git-svn-id: svn://svn.savannah.gnu.org/nano/trunk/nano@814 35c25a1d-7b9e-4130-9fde-d3aeb78583b8

nano.c

@@ -2288,7 +2288,7 @@ void help_init(void)
 
     /* Now add our shortcut info */
     for (i = 0; i <= MAIN_LIST_LEN - 1; i++) {
-	if (main_list[i].val)
+	if (main_list[i].val > 0)
 	   sofar = snprintf(buf, BUFSIZ, "^%c	", main_list[i].val + 64);
 	else
 	   sofar = snprintf(buf, BUFSIZ, "	");