proftpd: don't test if the binary exists in the init script

The test doesn't make sense. It just exits without any error if the
binary doesn't exist, which is silly.

Replace the DAEMON variable, which was used only once, by the full path
of the binary file.

Signed-off-by: Carlos Santos <casantos@datacom.ind.br>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

package/proftpd/S50proftpd

@@ -1,15 +1,13 @@
 #!/bin/sh
 
-DAEMON=/usr/sbin/proftpd
 trap "" HUP
 trap "" TERM
-test -f $DAEMON || exit 0
 [ ! -d /var/run/proftpd ] && mkdir /var/run/proftpd
 [ ! -f /var/log/wtmp ] && touch /var/log/wtmp
 
 start() {
 	printf "Starting ProFTPD: "
-	$DAEMON
+	/usr/sbin/proftpd
 	if [ $? != 0 ]; then
 		echo "FAILED"
 		exit 1