rfkill: Add constant for RFKILL_TYPE_FM radio devices

Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
Signed-off-by: Janakiram Sistla <janakiram.sistla@gmail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/net/rfkill/core.c b/net/rfkill/core.c
index ba2efb9..09f4e16 100644
--- a/net/rfkill/core.c
+++ b/net/rfkill/core.c
@@ -592,11 +592,13 @@
 		return "wwan";
 	case RFKILL_TYPE_GPS:
 		return "gps";
+	case RFKILL_TYPE_FM:
+		return "fm";
 	default:
 		BUG();
 	}
 
-	BUILD_BUG_ON(NUM_RFKILL_TYPES != RFKILL_TYPE_GPS + 1);
+	BUILD_BUG_ON(NUM_RFKILL_TYPES != RFKILL_TYPE_FM + 1);
 }
 
 static ssize_t rfkill_type_show(struct device *dev,