ftrace: Fix accounting bug with direct->count in register_ftrace_direct()

The direct->count wasn't being updated properly, where it only was updated
when the first entry was added, but should be updated every time.

Fixes: 013bf0da ("ftrace: Add ftrace_find_direct_func()")
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>

kernel/trace/ftrace.c

@@ -5093,8 +5093,7 @@ int register_ftrace_direct(unsigned long ip, unsigned long addr)
 			ftrace_direct_func_count--;
 		}
 	} else {
-		if (!direct->count)
-			direct->count++;
+		direct->count++;
 	}
  out_unlock:
 	mutex_unlock(&direct_mutex);