staging: lustre: o2iblnd: use bool assignment to true/false

Replace 0 with false in tx_pages_mapped = 0 to be consistent with
the rest of the lustre code.

Signed-off-by: Nicholas Hanley <[e-mail]>
Reviewed-by: Andreas Dilger <[e-mail]>
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

drivers/staging/lustre/lnet/klnds/o2iblnd/o2iblnd.c

···
 {
 	__u64 *pages = tx->tx_pages;
 	bool is_rx = (rd != tx->tx_rd);
-	bool tx_pages_mapped = 0;
+	bool tx_pages_mapped = false;
 	struct kib_fmr_pool *fpo;
 	int npages = 0;
 	__u64 version;