staging: lustre: obd: Remove duplicate inclusion of header file

Removed the header file included twice.
Signed-off-by: Sachin Kamat <sachin.kamat@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/lustre/lustre/include/obd.h

@@ -52,7 +52,6 @@
 #include <lustre_lib.h>
 #include <linux/libcfs/bitmap.h>
 #include <lu_ref.h>
-#include <lustre_lib.h>
 #include <lustre_export.h>
 #include <lustre_fid.h>
 #include <lustre_fld.h>