Revert "fs: sdfat: Fix compilation on Linux 3.10"

This reverts commit 9ef89635.

fs/sdfat/sdfat.c

@@ -2423,11 +2423,7 @@ static struct dentry *__sdfat_lookup(struct inode *dir, struct dentry *dentry)
 		 * In such case, we reuse an alias instead of new dentry
 		 */
 		if (d_unhashed(alias)) {
-#if LINUX_VERSION_CODE < KERNEL_VERSION(3, 10, 0)
-			BUG_ON(alias->d_name.hash != dentry->d_name.hash && alias->d_name.len != dentry->d_name.len);
-#else
 			BUG_ON(alias->d_name.hash_len != dentry->d_name.hash_len);
-#endif
 			sdfat_msg(sb, KERN_INFO, "rehashed a dentry(%p) "
 				"in read lookup", alias);
 			d_drop(dentry);