usb-storage: make datafab a separate module

This patch (as1213) converts usb-storage's datafab subdriver into a
separate module.

Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/drivers/usb/storage/Kconfig b/drivers/usb/storage/Kconfig
index 14508b8..7dac413 100644
--- a/drivers/usb/storage/Kconfig
+++ b/drivers/usb/storage/Kconfig
@@ -32,12 +32,14 @@
 	  verbose debugging messages.
 
 config USB_STORAGE_DATAFAB
-	bool "Datafab Compact Flash Reader support"
+	tristate "Datafab Compact Flash Reader support"
 	depends on USB_STORAGE
 	help
 	  Support for certain Datafab CompactFlash readers.
 	  Datafab has a web page at <http://www.datafabusa.com/>.
 
+	  If this driver is compiled as a module, it will be named ums-datafab.
+
 config USB_STORAGE_FREECOM
 	tristate "Freecom USB/ATAPI Bridge support"
 	depends on USB_STORAGE