FS-4042 fix a file path

build/freeswitch.init.redhat

@@ -17,7 +17,7 @@
 PROG_NAME=freeswitch
 PID_FILE=${PID_FILE-/var/run/freeswitch/freeswitch.pid}
 FS_USER=${FS_USER-freeswitch}
-FS_FILE=${FS_FILE-/usr/freeswitch} 
+FS_FILE=${FS_FILE-/usr/bin/freeswitch} 
 FS_HOME=${FS_HOME-/var/run/freeswitch}
 LOCK_FILE=/var/lock/subsys/freeswitch
 FREESWITCH_ARGS="-nc"