efi: efivars: add efivars printk prefix

Add an 'efivars: ' printk prefix to make the log entries stand out more,
for example:

	efivars: Registered efivars operations

While at it, change the sole remaining direct printk() call to pr_err().

Signed-off-by: Johan Hovold <[email protected]>
Signed-off-by: Ard Biesheuvel <[email protected]>

Author: jhovold

drivers/firmware/efi/vars.c

@@ -6,6 +6,8 @@
  * Copyright (C) 2004 Intel Corporation <[email protected]>
  */
 
+#define pr_fmt(fmt) "efivars: " fmt
+
 #include <linux/types.h>
 #include <linux/sizes.h>
 #include <linux/errno.h>
@@ -90,7 +92,7 @@ int efivars_unregister(struct efivars *efivars)
 		return -EINTR;
 
 	if (!__efivars) {
-		printk(KERN_ERR "efivars not registered\n");
+		pr_err("efivars not registered\n");
 		rv = -EINVAL;
 		goto out;
 	}