wimax/i2400m: rename misleading I2400M_PL_PAD to I2400M_PL_ALIGN

The constant is being use as an alignment factor, not as a padding
factor; made reading/reviewing the code quite confusing.

Signed-off-by: Inaky Perez-Gonzalez <inaky@linux.intel.com>
diff --git a/drivers/net/wimax/i2400m/rx.c b/drivers/net/wimax/i2400m/rx.c
index 7643850..07c32e6 100644
--- a/drivers/net/wimax/i2400m/rx.c
+++ b/drivers/net/wimax/i2400m/rx.c
@@ -1148,7 +1148,7 @@
 	num_pls = le16_to_cpu(msg_hdr->num_pls);
 	pl_itr = sizeof(*msg_hdr) +	/* Check payload descriptor(s) */
 		num_pls * sizeof(msg_hdr->pld[0]);
-	pl_itr = ALIGN(pl_itr, I2400M_PL_PAD);
+	pl_itr = ALIGN(pl_itr, I2400M_PL_ALIGN);
 	if (pl_itr > skb->len) {	/* got all the payload descriptors? */
 		dev_err(dev, "RX: HW BUG? message too short (%u bytes) for "
 			"%u payload descriptors (%zu each, total %zu)\n",
@@ -1166,7 +1166,7 @@
 		single_last = num_pls == 1 || i == num_pls - 1;
 		i2400m_rx_payload(i2400m, skb, single_last, &msg_hdr->pld[i],
 				  skb->data + pl_itr);
-		pl_itr += ALIGN(pl_size, I2400M_PL_PAD);
+		pl_itr += ALIGN(pl_size, I2400M_PL_ALIGN);
 		cond_resched();		/* Don't monopolize */
 	}
 	kfree_skb(skb);