initialize a variable to silence compiler.

The type of warnings emitted depends on the optimization level,
at the lower levels the compiler doesn't always understand what the
programmer has in mind. In this case I could not understand it either.



git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@89108 65c4cc65-6c06-0410-ace0-fbb531ad65f3

channels/chan_unistim.c

@@ -935,7 +935,7 @@ static void send_end_call(struct unistimsession *pte)
 
 static void set_ping_timer(struct unistimsession *pte)
 {
-	unsigned int tick;
+	unsigned int tick = 0;	/* XXX what is this for, anyways */
 
 	pte->timeout = pte->tick_next_ping;
 	DEBUG_TIMER("tick = %u next ping at %u tick\n", tick, pte->timeout);