powerpc/fadump: Trivial fix of spelling mistake, clean up message

Fix trivial spelling mistake "rgistration". Also use pr_err()
instead of printk() and unsplit the string to keep it all on one
line.
Signed-off-by: Colin Ian King <colin.king@canonical.com>
[mpe: Keep rc on the same line, splitting it doesn't help]
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

arch/powerpc/kernel/fadump.c

@@ -1009,9 +1009,8 @@ static int fadump_invalidate_dump(struct fadump_mem_struct *fdm)
 	} while (wait_time);
 
 	if (rc) {
-		printk(KERN_ERR "Failed to invalidate firmware-assisted dump "
-			"rgistration. unexpected error(%d).\n", rc);
-		return rc;
+		pr_err("Failed to invalidate firmware-assisted dump registration. Unexpected error (%d).\n", rc);
+		return rc
 	}
 	fw_dump.dump_active = 0;
 	fdm_active = NULL;