remove extra if loop and replace with elif

mail/mutt/pkg/INSTALL

@@ -1,5 +1,5 @@
 #!/bin/sh
-# $OpenBSD: INSTALL,v 1.2 2000/08/04 17:55:26 brad Exp $
+# $OpenBSD: INSTALL,v 1.3 2000/08/09 00:45:27 brad Exp $
 #
 # Pre/post-installation setup of mutt
 
@@ -53,13 +53,11 @@ case $2 in
     POST-INSTALL)
 	if [ ! -d $CONFIG_DIR ]; then
 	    do_install $1
-	else
-	 if [ ! -f $CONFIG_DIR/Muttrc ]; then
+	elif [ ! -f $CONFIG_DIR/Muttrc ]; then
 	    do_install $!
 	else
 	    do_notice $1
 	fi
-	fi
 	;;
     *)
 	echo "usage: $0 distname { PRE-INSTALL | POST-INSTALL }" >&2