[IA64] perfmon.c: fix bug in previous "fix"

- undo the pfm_context_free() call in pfm_handle_work().
  The logic is different. In the case of a controlling
  task exiting while monitored in pfm_handle_work. The
  context is freed in pfm_close() and not pfm_handle_work().
signed-off-by: stephane eranian <eranian@hpl.hp.com>
Signed-off-by: Tony Luck <tony.luck@intel.com>

arch/ia64/kernel/perfmon.c

@@ -5009,7 +5009,7 @@ pfm_handle_work(void)
 	unsigned long flags;
 	unsigned long ovfl_regs;
 	unsigned int reason;
-	int ret, must_free = 0;
+	int ret;
 
 	ctx = PFM_GET_CTX(current);
 	if (ctx == NULL) {
@@ -5087,7 +5087,6 @@ pfm_handle_work(void)
 do_zombie:
 		DPRINT(("context is zombie, bailing out\n"));
 		pfm_context_force_terminate(ctx, regs);
-		must_free = 1;
 		goto nothing_to_do;
 	}
 	/*
@@ -5102,8 +5101,6 @@ pfm_handle_work(void)
 nothing_to_do:
 
 	UNPROTECT_CTX(ctx, flags);
-
-	if (must_free) pfm_context_free(ctx);
 }
 
 static int