Staging: speakup: Use kmemdup rather than duplicating its implementation

---
 drivers/staging/speakup/kobjects.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)
 
diff --git a/drivers/staging/speakup/kobjects.c b/drivers/staging/speakup/kobjects.c
index 07a7f54..2093896 100644
--- a/drivers/staging/speakup/kobjects.c
+++ b/drivers/staging/speakup/kobjects.c
@@ -265,12 +265,11 @@ static ssize_t keymap_store(struct kobject *kobj, struct kobj_attribute *attr,
 	unsigned long flags;
 
 	spk_lock(flags);
-	in_buff = kmalloc(count + 1, GFP_ATOMIC);
+	in_buff = kmemdup(buf, count + 1, GFP_ATOMIC);
 	if (!in_buff) {
 		spk_unlock(flags);
 		return -ENOMEM;
 	}
-	memcpy(in_buff, buf, count + 1);
 	if (strchr("dDrR", *in_buff)) {
 		set_key_info(key_defaults, key_buf);
 		pr_info("keymap set to default values\n");