staging/lustre/libcfs: remove filp_read

no users.

Cc: Andreas Dilger <andreas.dilger@intel.com>
Signed-off-by: Peng Tao <bergwolf@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/lustre/include/linux/libcfs/linux/linux-fs.h

@@ -52,9 +52,6 @@
 #include <linux/backing-dev.h>
 #include <linux/posix_acl_xattr.h>
 
-#define filp_read(fp, buf, size, pos)			\
-	((fp)->f_op->read((fp), (buf), (size), pos))
-
 #define filp_write(fp, buf, size, pos)			\
 	((fp)->f_op->write((fp), (buf), (size), pos))