Fix file references in Kconfig files

This patch fixes file references to moved or deleted files
outside of Documentation/.

Signed-off-by: Johann Felix Soden <johfel@users.sourceforge.net>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
diff --git a/drivers/net/irda/Kconfig b/drivers/net/irda/Kconfig
index 25bb2a0..a40fab4 100644
--- a/drivers/net/irda/Kconfig
+++ b/drivers/net/irda/Kconfig
@@ -183,7 +183,7 @@
 	  Say Y here if you want to build support for the Adaptec Airport 1000
 	  and 2000 dongles.  If you want to compile it as a module, choose
 	  M here. Some information is contained in the comments
-	  at the top of <file:drivers/net/irda/old_belkin.c>.
+	  at the top of <file:drivers/net/irda/old_belkin-sir.c>.
 
 config ACT200L_DONGLE
 	tristate "ACTiSYS IR-200L dongle"