audio/oss: Save mixer before unloading module

After installing the oss package, a kernel panic occurs every time the
computer is shut down.

This is because the mixer RC script tries to save the mixer values after
the OSS module is unloaded.  We can avoid this by making OSS unload after
this is done.

[crees] While here, pet rclint.

PR:	ports/270709

audio/oss/Makefile

@@ -1,6 +1,6 @@
 PORTNAME=	oss
 DISTVERSION=	4.2-build2019
-PORTREVISION=	3
+PORTREVISION=	4
 CATEGORIES=	audio
 MASTER_SITES=	http://www.opensound.com/developer/sources/stable/bsd/
 DISTNAME=	${PORTNAME}-v${DISTVERSION}-src-bsd

audio/oss/files/oss.in

@@ -2,19 +2,21 @@
 
 # PROVIDE: oss
 # REQUIRE: DAEMON
+# BEFORE: mixer
 # KEYWORD: nojail shutdown
 
 . /etc/rc.subr
 
-name="oss"
+name=oss
 rcvar=oss_enable
-
-stop_cmd="oss_stop"
-start_cmd="oss_start"
+desc="Load Open Sound System kernel modules"
 
 load_rc_config $name
 
-: ${oss_enable=NO}
+: ${oss_enable:=NO}
+
+stop_cmd=oss_stop
+start_cmd=oss_start
 
 oss_start()
 {