Create a function for the code from r192246 so that it can be used both

times mount is called.

Limit the automatic behavior to when AUTO is specified (as it is in
etc/defaults/rc.conf) and for everything else take advantage of all
of the goodness in checkyesno.

etc/rc.d/tmp

@@ -37,20 +37,20 @@ stop_cmd=':'
 
 load_rc_config $name
 
+mount_tmpmfs ()
+{
+	if ! /bin/df /tmp | grep -q "^/dev/md[0-9]"; then
+		mount_md ${tmpsize} /tmp "${tmpmfs_flags}"
+		chmod 01777 /tmp
+	fi
+}
+
 # If we do not have a writable /tmp, create a memory
 # filesystem for /tmp.  If /tmp is a symlink (e.g. to /var/tmp,
 # then it should already be writable).
 #
 case "${tmpmfs}" in
-[Yy][Ee][Ss])
-	if ! /bin/df /tmp | grep -q "^/dev/md[0-9]"; then
-		mount_md ${tmpsize} /tmp "${tmpmfs_flags}"
-		chmod 01777 /tmp
-	fi
-	;;
-[Nn][Oo])
-	;;
-*)
+[Aa][Uu][Tt][Oo])
 	if _tmpdir=$(mktemp -d -q /tmp/.diskless.XXXXXX); then
 		rmdir ${_tmpdir}
 	else
@@ -59,9 +59,13 @@ case "${tmpmfs}" in
 			echo "dropping into shell, ^D to continue anyway."
 			/bin/sh
 		else
-			mount_md ${tmpsize} /tmp "${tmpmfs_flags}"
-			chmod 01777 /tmp
+			mount_tmpmfs
 		fi
 	fi
 	;;
+*)
+	if checkyesno tmpmfs; then
+		mount_tmpmfs
+	fi
+	;;
 esac