aa-remove-unknown: Drop superfluous $0 parameter from usage()

$0 is always the name of the script, even if using it inside a function.
Therefore use $0 directly, and no longer hand it over as a parameter.

utils/aa-remove-unknown

@@ -25,8 +25,8 @@ DRY_RUN=0
 . $APPARMOR_FUNCTIONS
 
 usage() {
-	local progname="$1"
-	local rc="$2"
+	local progname="$0"
+	local rc="$1"
 	local msg="usage: ${progname} [options]
 
 Remove profiles unknown to the system
@@ -45,14 +45,14 @@ Options:
 }
 
 if [ "$#" -gt 1 ] ; then
-	usage "$0" 1
+	usage 1
 elif [ "$#" -eq 1 ] ; then
 	if [ "$1" = "-h" -o "$1" = "--help" ] ; then
-		usage "$0" 0
+		usage 0
 	elif [ "$1" = "-n" ] ; then
 		DRY_RUN=1
 	else
-		usage "$0" 1
+		usage 1
 	fi
 fi