[POWERPC] Remove unnecessary cast in arch_deref_entry_point()

func_descr_t->entry is already an unsigned long.  Mea culpa.
Signed-off-by: Michael Ellerman <michael@ellerman.id.au>
Signed-off-by: Paul Mackerras <paulus@samba.org>

arch/powerpc/kernel/kprobes.c

@@ -498,7 +498,7 @@ int __kprobes kprobe_exceptions_notify(struct notifier_block *self,
 #ifdef CONFIG_PPC64
 unsigned long arch_deref_entry_point(void *entry)
 {
-	return (unsigned long)(((func_descr_t *)entry)->entry);
+	return ((func_descr_t *)entry)->entry;
 }
 #endif