rfkill: Fix sparse warning

Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/net/rfkill/rfkill.c b/net/rfkill/rfkill.c
index 47e8cd0..73d60a3 100644
--- a/net/rfkill/rfkill.c
+++ b/net/rfkill/rfkill.c
@@ -27,6 +27,10 @@
 #include <linux/mutex.h>
 #include <linux/rfkill.h>
 
+/* Get declaration of rfkill_switch_all() to shut up sparse. */
+#include "rfkill-input.h"
+
+
 MODULE_AUTHOR("Ivo van Doorn <IvDoorn@gmail.com>");
 MODULE_VERSION("1.0");
 MODULE_DESCRIPTION("RF switch support");