Make the Photon timer safer so it doesn't give an error if its destroyed

before its used or multiple times. Also takes care of problem:

"Assertion: "Time to next timeout func is null." (nsnull != sFunc) at
 file nsAppShell.cpp, line 117"  as seen at the start of apprunner.


git-svn-id: svn://10.0.0.236/trunk@45598 18797224-902f-48f8-a5cc-f745e15eee43

mozilla/widget/timer/src/photon/nsTimer.cpp

@@ -127,6 +127,7 @@ NS_METHOD TimerImpl::SetupTimer( PRUint32 aDelay )
     return NS_ERROR_FAILURE;
   }
 
+  mTimerId = -1;
   err = timer_create( CLOCK_SOFTTIME, &mPulseMsg, &mTimerId );
   if( err != 0 )
   { 
@@ -194,7 +195,7 @@ void TimerImpl::Cancel()
       return;
     }
 	
-    mTimerId *= -1;   // HACK for Debug 
+    mTimerId = -1;   // HACK for Debug 
   }
 
   if( mInputId )