staging: rtl8192u: declare MODULE_FIRMWARE

declaring MODULE_FIRMWARE has apparently forgotten while removing the embedded
firmware arrays in 0a8692b5 (rtl8192u_usb:
Remove built-in firmware images).
Signed-off-by: Stefan Lippers-Hollmann <s.l-h@gmx.de>
Cc: stable <stable@kernel.org> [2.6.39+]
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/staging/rtl8192u/r819xU_firmware.c

@@ -399,10 +399,7 @@ bool init_firmware(struct net_device *dev)
 
 }
 
-
-
-
-
-
-
+MODULE_FIRMWARE("RTL8192U/boot.img");
+MODULE_FIRMWARE("RTL8192U/main.img");
+MODULE_FIRMWARE("RTL8192U/data.img");