correct typo in header to fix the build

Modified: trunk/reactos/include/ddk/iodef.h

--- trunk/reactos/include/ddk/iodef.h	2005-05-09 10:06:58 UTC (rev 15183)
+++ trunk/reactos/include/ddk/iodef.h	2005-05-09 11:02:48 UTC (rev 15184)
@@ -141,7 +141,7 @@

 
 #define SL_KEY_SPECIFIED           (0x1)
 #define SL_OVERRIDE_VERIFY_VOLUME  (0x2)

-#define SL_WRITE_THROUGHT          (0x4)

+#define SL_WRITE_THROUGH          (0x4)

 #define SL_FT_SEQUENTIAL_WRITE     (0x8)
 
 #define SL_FAIL_IMMEDIATELY        (0x1)