tracing: Remove unnecessary null test before debugfs_remove()

This fixes checkpatch warning:

"WARNING: debugfs_remove(NULL) is safe this check is probably not required"
Link: http://lkml.kernel.org/p/1403802871-8599-1-git-send-email-fabf@skynet.beSigned-off-by: NFabian Frederick <fabf@skynet.be>
Signed-off-by: NSteven Rostedt <rostedt@goodmis.org>

kernel/trace/trace.c

@@ -6071,10 +6071,8 @@ destroy_trace_option_files(struct trace_option_dentry *topts)
 	if (!topts)
 		return;
 
-	for (cnt = 0; topts[cnt].opt; cnt++) {
-		if (topts[cnt].entry)
-			debugfs_remove(topts[cnt].entry);
-	}
+	for (cnt = 0; topts[cnt].opt; cnt++)
+		debugfs_remove(topts[cnt].entry);
 
 	kfree(topts);
 }