i2c: Spelling fix (successful)

Signed-off-by: Jean Delvare <khali@linux-fr.org>
diff --git a/drivers/i2c/busses/i2c-piix4.c b/drivers/i2c/busses/i2c-piix4.c
index 9bbe96c..4ae3a2c 100644
--- a/drivers/i2c/busses/i2c-piix4.c
+++ b/drivers/i2c/busses/i2c-piix4.c
@@ -223,7 +223,7 @@
 			dev_err(&piix4_adapter.dev, "Failed! (%02x)\n", temp);
 			return -1;
 		} else {
-			dev_dbg(&piix4_adapter.dev, "Successfull!\n");
+			dev_dbg(&piix4_adapter.dev, "Successful!\n");
 		}
 	}