mfd: si476x-i2c: Fix spelling mistake "comptible" -> "compatible"

trivial fix to spelling mistake in dev_err message

Signed-off-by: Colin Ian King <colin.king@canonical.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
diff --git a/drivers/mfd/si476x-i2c.c b/drivers/mfd/si476x-i2c.c
index fb4ce6d0..c180b75 100644
--- a/drivers/mfd/si476x-i2c.c
+++ b/drivers/mfd/si476x-i2c.c
@@ -600,7 +600,7 @@
 unknown_revision:
 	dev_err(&core->client->dev,
 		"Unsupported version of the firmware: %d.%d.%d, "
-		"reverting to A10 comptible functions\n",
+		"reverting to A10 compatible functions\n",
 		major, minor1, minor2);
 
 	return SI476X_REVISION_A10;