treewide: fix errors in printk

This patch fix spelling typo in printk.

Signed-off-by: Masanari Iida <standby24x7@gmail.com>
Acked-by: Geert Uytterhoeven <geert@linux-m68k.org>
Acked-by: Randy Dunlap <rdunlap@infradead.org>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
diff --git a/arch/powerpc/platforms/powernv/opal.c b/arch/powerpc/platforms/powernv/opal.c
index 1999756..aedc974 100644
--- a/arch/powerpc/platforms/powernv/opal.c
+++ b/arch/powerpc/platforms/powernv/opal.c
@@ -324,7 +324,7 @@
 
 	/* check for errors. */
 	if (ret) {
-		pr_warning("%s: Failed to retrive opal message, err=%lld\n",
+		pr_warning("%s: Failed to retrieve opal message, err=%lld\n",
 				__func__, ret);
 		return;
 	}